Studies on the Varietal Difference of Harvest Index in Rice : Relationship between harvest index and dry matter production

Japanese Journal of Crop Science

Koh-ichiro ASANUMA¹  Masanori TOYOTA¹  Jing CUI¹  Akihito KUSUTANI¹ 

关键词: Dry matter production;    収穫指数;    Harvest index;    収穫指数構成要素;    Harvest index component;    水稲;    High-yielding ablilty;    多収性;    Rice;    物質生産;   

DOI  :  10.1626/jcs.69.351

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

Varietal differences harvest index (HI) and yield (Y) were examined using 60 Japanese varieties (J group) and 20 high-yielding varieties bred in Asian countries (H group). HI varied from 36.8% to 53.4%. Mean values of HI were 43.5% in the J group and 48.8% in the H group. Y ranged form 22.6g/plant to 40.0g/plant. The mean value of Y in the J group was 27.8g/plant, and that in the H grouo was 34.1g/plant. A significant positive correlation was found between HI and Y in the H group, but the correlation was not significant in the J group. There was a significant negative correlation between HI and total dry weight at the maturing time (W2) in the J group, but the correlation was not significant in the H group. The relationship between HI and dry matter production was examined by dividing HI into the following three components, based on the number of spikelets (N) and total dry weight at the heading time (W1), and W2. HI=Y/W2=[W1/W2]×[N/W1]×[Y/N] HI showed a negative correlation with W1/W2 in both groups. HI also had a positive correlation with N/W1 in the J group and with Y/N in the H group. W1/W2, N/W1 and Y/N are presumed to be indicators of the balance of dry matter production around heading time, the efficiency of spikelet production and the ripening ability, respectively. Therefore, these results suggest that varieties with relatively higher dry matter productivity after heading have higher HI in rice. Furthermore, HI was assumed to be affected by the efficiency of spikelet production in the J group and by the ripening ability in the H group.

【 授权许可】

Unknown