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- 저자 : Olumekun Victor Olugbenga (검색결과 1 건)
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Ajayi Abiola Toyin,Gbadamosi Alaba Emmanuel,Olumekun Victor Olugbenga,Adedeji Iyanu,Ibrahim Nofisat Ronke 한국작물학회 2023 Journal of crop science and biotechnology Vol.26 No.2
Drought is one of the major limiting factors to cowpea growth and productivity. However, improvement for drought tolerance requires adequate knowledge of the level of genetic variability for diferent morphological and physiological traits, their interactions, and how they contribute to yield under drought stress. The present study assessed the level of genetic variation in morphological and physiological responses of selected accessions of cowpea under drought stress at the vegetative stage. The experiment was conducted in the screen house in pots flled with topsoil; when plants were 5 weeks old, drought stress was imposed by withholding watering for three weeks. Signifcant diferences were observed among accessions for measured parameters. The most susceptible accession (ACC10) had the highest percentage of wilted plants (PWP, 96.67%), the lowest percentage recovery (8.86%), and seed yield (0.00 g). Mean tolerance indices ranged from 0.72 in accession ACC10 to 1.27 in accession ACC07. ACC07 and accession ACC09 were the highly tolerant accessions, while ACC10 and accession ACC04 were the highly susceptible ones. Parameters such as chlorophyll B and total chlorophyll were reduced signifcantly in all accessions under drought stress, but chlorophyll A and stomatal parameters increased in very few accessions. High heritability (≥60%) and high genetic advance as a percent of the mean (≥20%) displayed among traits such as stomatal parameters, PWP, and seed yield under drought stress suggest that such traits are reliable parameters for efective selection of drought-tolerant cowpea genotypes for regions aficted with moisture defcit. Principal Component Analysis (PCA) also showed that stomatal parameters had higher contributions to the variability of the crop under drought stress compared to chlorophyll parameters in most cases, making it more preferred parameters for selection to be efective.
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