Studies on japonica hybrid rice seed production under Egyptian conditions

الملخص EN

Two- experiments were conducted at Sakha Experimental Farm of Sakha Agricultural Research station, Kaferelsheikh, Egypt during 2016 and 2017 rice growing seasons.

The objective of this investigation was to study the effect of three Male(P):Female(S) rows ratio (2P:6S, 2P:8S and 2P:10S) and two pollen directions of the pollen parental line (P), one direction and two directions on out-crossing rate for Japonica hybrid rice seed production.

Japonica hybrid produce through crossed between one Thermo-sensitive Genic Male Sterile (TGMS) line (TG-60-6) as a female line (S) with Sakha105 which used as a male pollinator line (P).

A split-plot design with three replications was used.

The main plots were dedicated to rows ratio whereas direction of the pollen parental line was arranged within the sub plots.

The results notify that the better row ratio was 2P:6S gave the best seed yield hill-1 (25.00 and 27.38 g) in 2016 and 2017 seasons respectively.

For direction of the pollen parental line, the best F1 seed yield hill-1 (25.89 and 27.45 g) were obtained once planted the spore parental line in two directions during 2016 and 2017 seasons, respectively.

The interaction between row ratio and direction of the pollen parental line was highly significant for panicle weight (g), seed set (%), number of fertile panicles hill-1, harvest index (%), and seed yield hill-1, but not significant for plant height (cm) and panicle length (cm) during 2016 and 2017 seasons.

The results notify the importance of optimum row ratio and direction planted of pollen parental line for increasing the out-crossing rate in Japonica hybrid seed