Waterlogging resistance in mungbean
1992
Somsong Chotechuen
Substantial varietal differences were found in most plant characters. Results showed the effective use of covariance technique to adjust for variability between the test plots. Based on yielding ability, six out of the 220 accessions were classified as waterlogging resistant varieties. Significant relationships were observed among most plant characters. Seed yield was highly correlated with plant vigor and with plant height at flowering, suggesting that these two parameters can be used as indicator in screening of mungbean under flooded yield condition. In general, plants subjected to more times and/or longer flooding duration exhibited severe stress symptoms more than those subjected to flooding once and/or shorter period. Growth stage had marked effects on adventitious root formation. At vegetative stage, plants developed more adventitious roots with more times and/or longer duration of flooding, whereas at reproductive stage, frequency and duration of flooding had no or very little effects. Mungbean plants were most susceptible to both frequency and duration of flooding at flowering stage. Less varietal differences were observed among 10 mungbean varieties evaluated although flooding treatment reduced plant height, number of leaflets per plant, plant dry weight, total dry matter, and yield by 48, 45, 38, 31, and 24%, respectively. Significant correlations were found between yield and number of leaflets per plant, percent yield reduction and plant dry weight, and percent yield reduction and number of leaflets per plant, whereas most of the plant characters were not interrelated.
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