Morpho-Physiological responses of brown-seeded soybean genotypes under low light intensity

The objective of the study was to know the responses of morphological and physiological traits of brown-seeded soybeanunder low light intensity. The study was conducted using the Experimental Method and the Split Plot Design was used in the experiment. The main plot was light intensity (L) and the subplot was genotypes (G). The main plot consists of L0 (fully light intensity) and L1(low light intensity, under black shading net of 65% light intensity). The brown-seeded soybean consists of 13 genotypes (KH 7B, KH 7C, KH 7D, KH 9, KH 14, KH 50B, KH 35, KH 8B, KH 31A, KH 35E, Ceneng, Burangrang, and KH1). The 13 genotypes were planted in pots in three replicates. Results of the study showed that: (1)The morpho-physiological responses of brown-seeded soybean varied under the low light intensity: the plant height, the leaf area, and the chlorophyll A and B contents increased, but the number of productive branches, the number of leaves, the specific leaf weight, the number of seeds per plant, the number of filled pods, the number of empty pods, and the seed weight per plant decreased. (2) Under the low light intensity, KH9 indicated the highest plant height, number of productive branches, number of leaves, and chlorophyll b content but the lowest seed size (100 seed weight), KH35E produced a high number of seeds per plant and filled pods, KH1 indicated the highest of the 100 seed weight, KH35 tends to produce the highest seed weight per plant, chlorophyll A content, and stable of the seed weight per plant.