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Improving selection efficiency for drought adaptation in pearl millet [Pennisetum glaucum (L.) R. Br.] by tracking plant canopy traits using LeasyScan
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Improving selection efficiency for drought adaptation in pearl millet [Pennisetum glaucum (L.) R. Br.] by tracking plant canopy traits using LeasyScan

  1. About ICRISAT: www.icrisat.org ICRISAT’s scientific information: http://EXPLOREit.icrisat.org May 2017 Vaibhav P Chaudhary, Visiting Scientist, Pearl Millet Breeding International Crops Research Institute for the Semi-Arid Tropics, Patancheru, India Improving selection efficiency for drought adaptation in pearl millet [Pennisetum glaucum (L.) R. Br.] by tracking plant canopy traits using LeasyScan Introduction ▪▪ Drought is a major abiotic constraint affecting pearl millet production globally. (Yadav et al. 2002. Theor Appl Genet, 104: 67–83). ▪▪ Preliminary screening results using LeasyScan have demonstrated that it can well categorize and identify pearl millet hybrid parents and hybrids suitable for drought- prone environments. ▪▪ This project will validate and enhance possibilities of integrating newly-found screening protocol system of LeasyScan with breeding programs working for drought- prone environments to enhance cultivar performance in farmers’ fields in one of the harshest ecologies of India. Objectives ▪▪ To investigate relationship between drought-tolerant breeding materials identified through LeasyScan and on the basis of screening under drought-prone target ecology of pearl millet. ▪▪ To identify the effective season of screening for drought adaptation under LeasyScan. Materials ▪▪ Pearl millet hybrids and hybrid parents of different ecology ▪▪ LeasyScan platform of ICRISAT Methodology Step 1: ▪▪ Screening of hybrid parents/ hybrids for drought tolerance linked canopy traits under LeasyScan under two contrasting seasons (Summer and Rainy) at ICRISAT for the plant canopy traits (total leaf area, plant height, leaf area index, leaf angle). Step 2: ▪▪ Screening of hybrid parents/ hybrids (same set as mentioned in Step 1) for drought tolerance/ susceptibility under drought-prone target ecology of north- western India for target traits (panicle threshing percentage, number of tillers, date of flowering, and grain yield). Step 3: ▪▪ Investigate relationship between results of LeasyScan and field results from target ecology to standardize screening protocol for drought tolerance in pearl millet. Expected Output and Outcome ▪▪ The correlation between LeasyScan screening result and target ecology observation, if found positive and significant, will guide breeders to screen and select pearl millet cultivars suited to drought-prone environments using LeasyScan. ▪▪ Higher correlation (matching of the screening results) value will increase confidence of breeders to phenotype their hybrid parents and hybrids under this newly-evolved High Throughput Phenotyping (HTP) Platform of LeasyScan and improve selection efficiency of breeding program for drought-prone environments. ▪▪ Also, the investigation for the vapor pressure deficit (VPD) effect on canopy development across seasons at ICRISAT will help the future screening programs to identify the effective season for pearl millet (Summer or Rainy season). Usefulness of LeasyScan will be validated for particular crop season in pearl millet, which will help the pearl millet breeders in further screening of materials for drought tolerance. Figure 2. Correlation between the leaf area development pattern of A1, A and B agroecological zones of India Figure 1. LeasyScan facility for drought screening at ICRISAT. Photos: ICRISAT
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