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High-throughput phenotyping for revealing key morpho-physiological traits for drought tolerance in pea (Pisum sativum and wild relatives)
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Resumo(s)
Pea (Pisum sativum) production is challenged by drought stress. Traditional methods for assessing drought tolerance are limited,and high-throughput phenotyping (HTP) can facilitate the rapid and automated assessment of plant traits. Herein, 180 Pisumspp. accessions were evaluated using an indoor HTP platform under two irrigation treatments, control (70% field capacity) anddrought stress (30% field capacity), for 50 days. A combination of digital phenotyping via imaging and manual measurements wasused to analyse biomass-related, architectural, and physiological traits. Drought conditions resulted in significant reductions inbiomass-related traits including fresh weight (47%), total leaf area (43%), and dry weight (41%). In contrast, PSII photochemicalefficiency, leaf weight ratio, and solidity showed negative sensitivity index values (ranging from −7% to −1%), indicating com-paratively lower sensitivity to drought and suggesting relative stability of these traits under water-limited conditions. The highheritability value for water use efficiency (0.87) suggests that this parameter may be useful for distinguishing pea's responsesto suboptimal soil moisture levels. Principal component analysis (PCA) highlighted patterns of trait variation and associationsamong biomass-related traits, such as fresh weight, dry weight, and leaf area, which were sensitive to drought conditions. Thissuggests that the plants may use a combination of strategies to cope with water limitations. Furthermore, studying the significantvariation in drought response among the diverse Pisum species and subspecies revealed distinct adaptation strategies. Thesefindings support the development of crops that are resilient to the negative effects of climate change.
Descrição
Palavras-chave
Architectural traits Drought sensitivity Heritability | pea collection Photosynthetic traits Plant phenotyping Stress sensitivity index
Contexto Educativo
Citação
Editora
Wiley-Blackwell Publishing Ltd