Evaluation of Male and Female Parents for F1 Hybrid Production of Leaf Mustard

Abstract

Seven F₁ hybrids, male and female parents of leaf mustard were tested in comparison with commercial varieties. A randomized complete block design with 3 replications was used. Yields of the varieties ranged from 2,016 to 4,435 kg./rai. Which was significantly different. Variety 2M gave the highest yielding variety. The F₁ hybrid BC9(4-4 x 2M) x 4OR was the highest yielding variety among the F₁ hybrids, it gave 3,468 kg./rai. Head weight of four  F₁ hybrids derived from BC9(4-3 x 19H) x 2M, BC9(4-4 x 4OR) x 19H9, BC9(4-4 x 4OR) x 2M and BC11(4-4 x 4OR) x 2M ranged from 350 to 450 g./head and they were significantly different from other F₁ hybrids. These sizes of heads were the desirable size by processing factory. However, trimming percentage was not significantly different. Results showed that most of  the F₁ hybrids exhibited negative heterotic effects on yield over their mid parents except the F₁ hybrid BC9(4-4x4OR)x19H9 which expressed promising negative heterosis effect on yield, head weight before  and after trimming, percentage of trimming and stem shape index, at 16.7, 33.5, 16.7, 17.8 and 21.9% respectively. Positive heterosis effect on solidity and head shape index at 42.5 and 1.6, respectively. The F₁ hybrid  BC11(4-4x4OR) x 2M, BC9(4-4x4OR) x 2M, BC9(4-3x19H) x 2M,  BC9(4-4x4OR) x 19H9, BC9(4-4x2M) x 19H9,  BC9(4-4x2M) x 4OR and BC11(4-4x4OR) x 19H16 which expressed promising negative heterobletiosis effect on yield, heterobletiosis value of 50.6, 50.5, 41.3, 35.1, 27.2, 16.0 and 13.9, respectively. The F₁ hybrids BC11(4-4x4OR) x 2M, BC9(4-4x4OR) x 2M, BC9(4-4x4OR) x 19H9, BC9(4-3x19H) x 2M, BC9(4-4x2M) x 19H9, BC11(4-4x4OR) x 19H16 and BC9(4-4x2M) x 4OR which expressed promising negative standards heterosis  effect on yield, had standards heterosis value of 47.4, 47.3, 38.6, 37.5, 31.1, 23.8 and 16.9, respectively.