| Abstract |
This work was undertaken at the Farm of Rice Research and Training
Center. (RRTC), Sakha, Kafr El-Sheikh, Egypt, to investigate the gene
action of some morphophysiological, yield and its attributing traits as
well as quality traits during 2023 and 2024 seasons. The plant materials
of this work included six parental varieties, i.e., Sakha104, Sakha106,
GZ11332, Sakha108, Sakha109, Sakha101 and 4 testers Viz., IHL17,
IHL65, IHL175, Super303 of rice. Combining ability was estimated ac
cording to Kempthorne (1954). The mean squares of genotypes and their
partitions were significant for studied traits. Yield and its associated
qualities were inherited due to non-additive gene activity. The most de
sirable SCA effects were obtained by crosses Sakha108xIHL17 for hull
ing% and head rice recovery. The highest SCA effects for milling% and
grain shape were detected by the crosses Sakha106xIHL175 and
GZ11332xSuper303, respectively . The highest heterosis relative to Mid
Parent and better -Parent were detected by crosses Sk106xSR303 for
hulling%, the cross Sakha109xIHL65 for head rice recovery, and the
cross GZ11332xSuper303 for grain shape. Regarding milling%, the best
heterotic effect was detected by the cross Sakha109xSR303 relative to
mid parent and the cross Sakha109xIHL65 relative to better parent. From
the previous results, the line Saka 109 and tester Super 303 were the best
parent. The cross Sakha 109 × Super 303 was the most desirable value
for grain yield plant and most of its attribute traits. As a result, this cross
is promising and may be applied in upcoming rice breeding initiatives to
improve yield potentiality and quality. |
