Sample Heading

BACK

Sample Heading

  1. Home
  2. Laxman R.H.

Laxman R.H.

Primary tabs

Designation: 
Principal Scientist (Plant Physiology)
Division/Section: 
Division of Basic Sciences
Specialisation: 
Plant Physiology
Qualification: 
M.Sc (Agri.,) PhD
Research Accomplishments: 

(During the Period of 2019-2023) 

  1. Standardized phenotyping methodology for evaluation of root characteristics in Capsicum species with the suitable container having 30 cm diameter and 32 cm height with 23 kg soil capacity.
  2. Identified six genotypes, IHR 4517, IHR 3529, IHR 4501, IHR 4550, IHR 4491 and IHR 3241 with better root characteristics. The genotypes, IHR 4501, IHR 3529 and IHR 4550 belonging to Capsicum chinense with better root characteristics and also higher gas exchange characteristics, MSI, RWC and lower MDA contents were identified having tolerant to deficit moisture stress (50% FC).
  3. Evaluation of fifteen Capsicum sp. genotypes belonging to Capsicum annuum, Capsicum baccatum and Capsicum chinense through gravimetric approach, resulted in identification of genotypes, IHR 4550 and IHR 4517 belonging to Capsicum chinense and cultivars Araka Lohit, Arka Haritha and Punjab Gucchedar belonging to Capsicum annuum, having tolerance to deficit water stress with lower reduction in photosynthesis rate, higher relative water content and better recovery after water replenishment.
  4. Imposition of PGPR treatment, P72, Bacillus amyloliquefaciens @ 20 g/l (106 CFU/gram) to chilli seedlings 10 days after sowing showed increase in plant height in Arka Haritha. Increase in plant height was also observed in the seedlings raised with bigger cavities of the protray (50 holes/protray) as compared to 72 and 98 holes per protray in both treated and un-treated plants.
  5. The three promising tomato hybrids, H-331, H-329, H-335 showed high temperature stress tolerance at 40°C/26°C.  Foliar spray of salicylic acid 5 mM was found to enhance high temperature (40°C) stress tolerance in tomato. The image-based changes in tomato plant digital biomass in the plant phenomics platform could be employed as one of the criteria for evaluation of tomato germplasm for water stress tolerance. Genotype, IIHR 4-3-3 with higher root volume, number of primary roots and root weight showed least reduction in digital biomass.
  6. Five mango rootstocks, Peach, Starch, Kensigton, Mylepelian and Vellaikulumban are identified as tolerant for grafting cv. Alphonso.
  7. Phenotyping of tomato genotypes and wild species for tolerant to deficit water stress based on biomass, root characteristics and various physiological and biochemical response indicated that two wild species, Solanum pimpinelifolium and Solanum galapagense and the cultivars, Arka Samrat, Arka Aditya, Arka Abhed, Arka Meghali and Arka Sourabh exhibited tolerance to deficit moisture stress.
  8. The PGPR, Bacillus amyloliquefaciens, P-72 treated plants showed higher photosynthetic rate, stomatal conductance, transpiration and chlorophyll fluorescence. PGPR treated plants performed better compared to untreated plants under moisture stress with respect to fruit weight and fruit number in tomato cvs. Arka Abhed and Arka Rakshak.
  9. Onion genotypes, Bhima Shakti, NHRDF RED-3 and Bhima Super showed higher tolerance. The cvs, Bhima Super, Agrifound dark Red, Phule Samarth and Bhima Shakti with lower per cent reduction in bulb weight were tolerant to excess moisture stress at peak bulb development stage.
  10. Among the twenty-four genotypes of eggplant cultivars, landraces and wild relatives evaluated for water logging stress tolerance, the two wild relatives, Solanum insanum and Solanum mammosum and two cultivars, Arka Neelkanth and Arka Keshav and exhibited tolerance to water logging stress. Arka Abhed and H-331 performed better under high temperature stress of 36.8 °C + 3 °C recording higher fruit weight and number. However, genotype IIHR 2202 had better fruit quality in terms of TSS, vitamin–C, total carotenoids and lycopene content.
  11. Inter-specific grafting of tomato on brinjal rootstock cv. Arka Neelkanth technology helps tomato crop to sustain excess moisture (water stagnation) stress for 6 days, without any adverse effects on yield. Cultivation of grafted tomato cv. Arka Rakshak on raised beds provided additional advantage in terms of 12.6% and 6% higher fruit yield and number of fruits per plant, respectively as compared to flatbed cultivation.
Varieties / Technologies Developed: 

 

  1. Arka Inter-Specific Tomato Graftage: A strategy to mitigate flooding stress in tomato. Inter-specific grafting of tomato on brinjal rootstock cv. Arka Neelkanth sustains water stagnation stress for six days. Ungrafted tomato plants show wilting symptoms after 24 hours of water stagnation. 
  2. Bacterial inoculant suitable for tomato cultivation under deficit irrigation conditions. Under field conditions, Bacillus amyloliquefaciens, P-72 applied at the rate of 5 kg/ha as a suspension (20g/l) on the seventh day of transplanting followed by another application on 30th day, improved the marketable yield levels of tomato by 28.26% over uninoculated plants when irrigated at 40% of pan evaporation
Publications: 

(Best 10/High Impact) 

  1. Arka Inter-Specific Tomato Graftage: A strategy to mitigate flooding stress in tomato. Inter-specific grafting of tomato on brinjal rootstock cv. Arka Neelkanth sustains water stagnation stress for six days. Ungrafted tomato plants show wilting symptoms after 24 hours of water stagnation. 
  2. Bacterial inoculant suitable for tomato cultivation under deficit irrigation conditions. Under field conditions, Bacillus amyloliquefaciens, P-72 applied at the rate of 5 kg/ha as a suspension (20g/l) on the seventh day of transplanting followed by another application on 30th day, improved the marketable yield levels of tomato by 28.26% over uninoculated plants when irrigated at 40% of pan evaporation.
  3. Laxman, R. H., Rao N. K. S., Geeta Birada, Sunoj V. S. J., Shivashankara, K. S., Pavithra C. B., Dhanyalakshmi, K. H., Manasa, K. M., Bhatt, R. M. Sadashiva A. T., Christopher M. G. 2014. Antioxidant enzymes activity and physiological response of tomato (Lycopersicon esculentum M.) genotypes   under mild temperature stress. Indian J. Plant Physiol. 19 (2): 161– 164.
  4. Mamatha, H., Srinivasa Rao, N.K., Laxman, R.H., Shivashankara, K.S., Bhatt, R.M. and Pavithra, K.C. 2014. Impact of elevated CO2 on growth, physiology, yield and quality of tomato (Lycopersicon esculentum Mill) cv. Arka Ashish. Photosynthetica. 52, (4)519-528.
  5. Rymbai, H., Laxman, R.H., Dinesh, M.R. John Sunoj, V.S. Ravishankar, K.V. and Jha A.K. 2014. Diversity in leaf morphology and physiological characteristics amongmango (Mangifera indica) cultivars popular in different agro-climatic regions of India. Scientia Horticulturae. 176, 189–193.
  6. Megha H.S., Ravishankar K. V, Shivashankar K. S, Tapas K. Roy, Laxman R. H., A. Rekha and P. Shilpa. 2016. Barrier against water loss: Relationship between epicuticular wax composition, gene expression and leaf water retention capacity in banana.  Functional Plant Biology 43(6):492-501.
  7. Laxman, R.H., Hemamalini, P., Bhatt, R.M., Sadashiva, A.T. 2018. Non-invasive quantification of tomato (Solanum lycopersicum L.) plant biomass through digital imaging using phenomics platform.  Ind J Plant Physiol. 23(2):369–375.
  8. Vidya, S.M., Vijay Kumar, H.S., Bhatt, R.M., Laxman, R.H. and Ravishankar, K.V. 2018. Transcriptional profiling and genes involved in acquired thermotolerance in Banana: a non-model crop. Scientific Reports, 8:10683 DOI:10.1038/s41598-018-27820-4.
  9. Geeta Biradar, Laxman R.H., Namratha M.R., Thippeswamy M., Bhatt R.M. and Sadashiva A.T. 2019. Evaluation of Solanum lycopersicum L. genotypes for high temperature stress tolerance employing temperature induction response technique Indian Journal of Experimental Biology. 57:680-689.
  10. Smaranika Mishra, Laxman, R. H., Madhavi Reddy K. and Venugopalan R. 2020. TIR approach and stress tolerance indices to identify donor for high-temperature stress tolerance in pepper (Capsicum annuum L.) Plant Genetic Resources: Characterization and Utilization 18(1); 19–27.
  11. Anuradha Sane, Sujatha, S., Shilpa, K.N., Laxman, R.H., Shivashankara K.S. 2020. Growth, yield, physiological and biochemical traits of different accessions of bird of paradise (Strelitzia reginae L.) Industrial Crops & Products 151 (2020) 112477
  12. Biradar, G., Laxman, R.H., Shivashankara, K.S. John Sunoj Valiaparambil Sebastin, 2022. Screening and selection of physio-biochemical traits to detect high temperature tolerance using multivariate analysis in tomato genotypes (Lycopersicon esculentum Mill). Acta Physiol Plant 44, 79.

Book Chapter

  1. Laxman R.H., Bhatt R.M. 2017. Abiotic Stress Management in Fruit Crops. In: Minhas P., Rane J., Pasala R. (eds) Abiotic Stress Management for Resilient Agriculture. Springer, Singapore, pp 399-412. 978-981-10-5743-4
  2. Laxman R.H., Upreti K. K., Shivashankara., K. S., Sadashiva A. T., Madhavi Reddy K., Aghora T. S., Smaranika Mishra 2020. Management Strategies for Alleviating Abiotic Stresses in Vegetable Crops. In: Rakshit A., Singh H., Singh A., Singh U., Fraceto L. (eds) New Frontiers in Stress Management for Durable Agriculture. Springer, Singapore ISBN: 978-981-15-1321-3
  3. Satisha J., Laxman R.H., Upreti K.K., Shivashankara K.S., Varalakshmi L.R., Sankaran M. 2020. Mechanisms of Abiotic Stress Tolerance and Their Management Strategies in Fruit Crops. In: Rakshit A., Singh H., Singh A., Singh U., Fraceto L. (eds) New Frontiers in Stress Management for Durable Agriculture. Springer, Singapore ISBN: 978-981-15-1321-3
  4. Laxman, R. H., Ravishankar, K. V., Prasanna, H. C., Ramesh, K. V., Rashmi, K., Kannan, S., Hara Gopal, K. Darshan, S. S. 2022. Physiological, Molecular and Genetic Analysis of Abiotic Stress Tolerance in Tomato. In: Kole, C (Ed.) Genomic Designing for Abiotic Stress Resistant Vegetable Crops. (pp 1-47). Springer International Publishing.  ISBN 978-3-031-03963-8

 

Awards & Recognitions: 

 

  1. Best Paper Award (2021). G.S. Sirohi Best Paper Award Indian Society of Plant Physiology (ISPP). For research paper entitled “Photosynthetic characteristics of sunflower leaves and bracts.
  2. Best Poster Award for the research “Capturing water deficit response of onion genotypes through imaging in plant phenomics facility” during International Symposium on Edible Alliums: Challenges and Opportunities held at Pune from 9-12 Feb 2019.
  3. Best Oral Presentation Award for the paper entitled “Phenotyping techniques for assessment of abiotic stress tolerance in banana” in the International Conference on Banana 2020: Innovations in sustainable production and value chain management in banana during 22-25 February 2020.
  4. Best Poster Award for the research “Estimation of leaf area and biomass in onion through machine vision under field conditions” by Laxman R.H, Hemamalini P, Rashmi K., Kannan S. in the International Plant Physiology Virtual Symposium on “Physiological Interventions for Climate Smart Agriculture (IPPVS 2021)” held during 11-12th March 2021 at ICAR-Sugarcane Breeding Institute, Coimbatore, Tamil Nadu.
  5. Best Oral Presentation Award for the paper entitled “Evaluation of eggplant wild relatives, landraces and cultivars for deficit moisture stress tolerance” in the International Conference on Reimagining Rainfed Agro ecosystems Challenges and Opportunities” held at CRIDA, Hyderabad from 22-24 Dec, 2022.
Address for Communication: 

# 324, 7th Main, 5th Cross, Coffee Board Layout, Hebbal-Kempapura, Bengaluru - 560 024

Email Address: 
laxman.rh@icar.gov.in
Telephone #: 
080-23086100 Extn 246