Abstract
Salinity is a major abiotic stress limiting mungbean production worldwide including Indonesia. Since mungbean plant is very sensitive to salt condition, selection of salinity tolerant genotypes becomes important for mungbean improvement. The objective of this study was to evaluate the tolerance of eight mungbean genotypes to salinity at seedling stage under different levels. The experiment was arranged in a randomized complete block design with two factors (mungbean genotypes and salinity levels) and triplicates. Observation variables were germination percentage, vigor index, germination rate, hypocotyls length, epicotyls length, root length, number of root, seedling fresh weight, and seedling dry weight. The result showed that increasing level of salinity concentration inhibited the speed of germination, germination percentage, vigor index, normal seedling fresh weight, and number of lateral roots. Murai and Vima 1 were identified as tolerant genotypes, while Vima-2 and MLGV 0180 were identified as salinity sensitive genotypes at seedling stage. Currently, mungbean varieties with special characters, such as saline-tolerant is not yet available. The availability of saline-tolerant variety of mungbean is a cheaper and easier technology for farmers to anticipate the expansion of the saline area. The tolerant genotypes may be further tested at the later stage to obtain promising genotype tolerant to salinity that effectively assist mungbean breeding program.
Highlights
Mungbean is one of important cash crop legumes in Indonesia, especially in dry regions due to its short life and good adaptation in drought condition
Plants Materials A total of eight genotypes used for this experiment consisted of five improved varieties, two introducing genotypes and one local genotype derived from Indonesian Legumes and Tuber Crops Research Institute’s (ILETRI) genebank, Indonesian Agency for Agricultural Research and Development (IAARD)
Increasing level of salinity concentration will decreasing the speed of germination, vigor index, germination, normal seedling fresh weight, and number of lateral roots
Summary
Mungbean is one of important cash crop legumes in Indonesia, especially in dry regions due to its short life (early maturity) and good adaptation in drought condition. In Indonesia, mungbean ranks third after soybean and groundnut as a strategic legumes crops. Mungbeans are rich with vegetable proteins and very popular as food raw material in Indonesian community. The Indonesian new release varieties (Vima 1, Vima 2 and Vima 3) have high protein content , i.e. 2128% on dry basis (ILETRI 2016). Mungbean is mostly used as food such as porridge, flour products, beverage products, cakes, noodles, sprouts and a small portion of fodder. The yield of mungbean is still low. The average yield is approximately 1.6 tons of dry grains per hectare with an area of agricultural land decreased
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