Genetic Characteristics of the Breaking Strength of the Basal Culm Related to Lodging Resistance in a Cross between Koshihikari and Chugoku 117

Japanese Journal of Crop Science

Taiichiro OOKAWA¹  Kuni ISHIHARA¹ 

关键词: Bending stress;    遺伝率;    Breaking strength;    挫折強度;    Heritability;    水稲;    Individual selection;    耐倒伏性;    Lodging resistance;    断面係数;    Long culm and ear weight type;    曲げ応力;    Paddy rice;    Section modulus;   

DOI  :  10.1626/jcs.66.603

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

In order to investigate the possibility of introducing lodging resistance into long culm and ear weight type rice cultivars, we studied the genetic characteristics of breaking strength related to lodging resistance in a cross between Koshihikari and Chugoku 117 with small and large section modulus, respectively, and their progenies. In the F1 plants, the mean section modulus was much higher than that in Koshihikari, while the mean of the bending stress was higher than that in Chugoku 117 as well as that in Koshihikari. Consequently, the mean of the bending moment at breaking of the basal internode (M) in the F1 population was much higher than that in Koshihikari as well as Chugoku 117. The M in F2 ranged widely from 800 to 2900 g cm, and eight plants of F2 exceeded the maximum value of Chugoku 117. The section modulus in F2 ranged widely from 8 to 25 mm3 and showed a trimodal frequency distribution. The ratio of 30 : 92 : 28 did not fit the 1 : 2 : 1 expected for one-gene segregation. The section modulus showed a comparatively large heritability value in the F2 line, so this character was expected to be effective for selection. Despite negative genotypic correlation between section modulus and bending stress, three plants in the F2 line had very high NI values due to large section modulus and large bending stress. The M and section modulus in the two F3 lines were almost large, corresponding to the selected F2 parental plants. From these results, there is a possibility of introducing lodging resistance into long culm type cultivars by individual selection.

【 授权许可】

Unknown