On combining ability and utilization of C815S male sterile lines

Abstract

The combining ability of 9 agronomic characters in F1was studied with 5 male sterile lines and 7 restorer lines by the way of p×q incomplete dual cross (NCⅡ) design. The result was that the general combining ability(GCA) of C815S was the best compared with dual-purpose genetic rice male sterile LongS, 7Guang S052, Peiai64S and CMS LineⅡ-32A. The GCA of the effective tillers number, total grain number, grain density, yield per plant and economic coefficient of C815S was 6.656, 6.342, 7.236, 16.669 and 6.705 respectively. It was ranked at first in the examined dual-purpose male sterile lines. The GCA of the seed setting rate and 1 000-grain weight were 0.329 and 2.353, respectively, which was ranked the 2nd. The GCA of plant height was-2.197, and it was ranked the fourth. The larger variance of specific combining ability was found in effective spikes and grain yield per plant of C815S. The effective spikes, grain density, 1 000-grain weight, grain yield per plant, the economic coefficient of 5 traits were classified into class Ⅰa nd classⅡin per panicle and seed setting rate, and classified into class Ⅳi n plant height and spike length.