The World Vegetable Center Okra ( Abelmoschus esculentus ) Core Collection as a Source for Flooding Stress Tolerance Traits for Breeding

Roland Schafleitner, Chen-Yu Lin, Ya-Ping Lin, Tien-Hor Wu, Cian-Huei Hung, Chooi-Lin Phooi, Shu-Hui Chu, Yu-Cen Jhong and Yun-Yin Hsiao
Additional contact information
Roland Schafleitner: The World Vegetable Center, Shanhua, Tainan 741, Taiwan
Chen-Yu Lin: The World Vegetable Center, Shanhua, Tainan 741, Taiwan
Ya-Ping Lin: The World Vegetable Center, Shanhua, Tainan 741, Taiwan
Tien-Hor Wu: The World Vegetable Center, Shanhua, Tainan 741, Taiwan
Cian-Huei Hung: Branch Station of Kaohsiung District Agricultural Research and Extension Station, Council of Agriculture, Executive Yuan, 2-6 Dehe Rd., Dehe Village, Changjhih Township, Pingtung County 90846, Taiwan
Chooi-Lin Phooi: The World Vegetable Center, Shanhua, Tainan 741, Taiwan
Shu-Hui Chu: The World Vegetable Center, Shanhua, Tainan 741, Taiwan
Yu-Cen Jhong: The World Vegetable Center, Shanhua, Tainan 741, Taiwan
Yun-Yin Hsiao: The World Vegetable Center, Shanhua, Tainan 741, Taiwan

Agriculture, 2021, vol. 11, issue 2, 1-13

Abstract: Okra ( Abelmoschus esculentus ) is a heat tolerant vegetable crop with high economic and nutritional importance in parts of Asia, Africa, and America. The okra biodiversity held in gene bank collections could be mined for traits for breeding more stress tolerant and nutritional cultivars. An okra core collection of 166 accessions comprising A. esculentus , A. moschatus , A. caillei , and A. manihot has been assembled from the World Vegetable Center germplasm collection (840 accessions) based on diversity analysis with 20 microsatellite markers. A selection of A. esculentus accessions of the core collection (75 accessions) and 20 breeder-selected genotypes have been screened for variation of their response to flooding stress under field conditions using a high throughput phenotyping system. Growth increment per day and changes of physiological indices were measured before, during, and after application of 9 days of flooding stress. Several accessions showed only a small reduction in daily growth increment during flooding. Across the germplasm panel, maintained growth was correlated with maintained normalized differential vegetation index and was negatively correlated with plant senescence index. Accessions with maintained growth and health under flooding were selected for future further analysis and use in breeding.

Keywords: Abelmoschus; gene bank collection; core collection; flooding stress; high throughput phenotyping (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2021
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