Abstract
To find useful indexes for the selection of new rice varieties having a high harvest index, the correlation of harvest index (HI) with morphological characteristics and leaf color was examined using 60 Japanese varieties (J group) and 20 high-yielding varieties bred in Asian countries (H group). In the J group, HI showed a positive correlation with leaf color (SPAD value, SV) and a negative correlation with plant length (PL) at the heading time. In the H group, HI showed a positive correlation with SV, but the correlation coefficient between HI and PL was not significant. The correlation berween HI and culm length (CL) was similar to that between HI and PL. HI showed a negative correlation with ear length (EL) in the J group, but significantly positive correlation in the H group. There was a significantly positive correlation between EL/CL and HI in the H group. A multiple regression analysis was conducted to clarify the relationship berween morphological characteristics and HI. A significant multiple correlation coefficient was obtained between HI and SV (X1), PL (X2) or EL/CL (X3). The ratio of standard partial regression coefficient of X1, X2 and X3 to HI was 54:15:31. Consequently, it is considered that these morphological characteristics are useful indexes to select varieties with a high harvest index.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
