Study Of Differences For The Compensatory Effect Of Yield Components Per Plant On The Different Yield Potential Varieties In Double-season Hybrid Rice

In order to prove up whether or not there were compensatory effects for the double-season early hybrid rice and the correlation between the yield potential of the varieties and the compensatory ability, excellent yield potential variety super early rice Ganxin203and the control variety Ganxin206, late rice WufengyouT025and the control variety ChangyoulOhao were selected to be conducted the treatments of tillers slicing (JN) pre-young panicle differentiation for changing the effective panicles per plant, grains spacing (SL) at heading for changing the grains per panicle, manpower assistant pollination (SF) at flower flying for changing seed-setting rate, and the difference of the leaf area, dry matter accumulation, grain filling, differentiated and degenerated of branches and spikelets, the vigor of the pollen and stigma between the different treatments of the two varieties were analyzed, the results were as follows.1.early rice:The panicle length and total grains per panicle increased significantly under the treatment of JN, the seed-setting rate increased and1000-grain weight decreased a little at the same time under the treatment of SF, and1000-grain weight improved under the treatment of SL for the two tested variety. The yield per plant of SF was the highest, JN the lowest, SL and the control were the middle in the all treatments of the two varieties, as suggested the structure compensatory ability on yield per plant of double-season early hybrid rice was limited. The yield per plant of SF of Ganxin203and Ganxin206was10.60and4.94per cent higher than that of the control, SL was3.97and3.29per cent lower, JN was9.85and27.26per cent lower respectively, as suggested the structure compensatory ability on yield per plant of Ganxin203was stronger than that of Ganxin206. JN treatment increased the differentiation and formation of the secondary branches and spikelets and decreased their degeneration, while this kind of ability of Ganxin203was stronger than that of Ganxin206. The leaf area and dry matter accumulation per plant of JN was clearly lower than that of the control, specific leaf weight higher, and the gap between the JN and the control of Ganxin203was higher than that of Ganxin206. The grain filling rate per panicle of the two varieties of JN was the highest, and the gap between the JN and the control of Ganxin203was higher than that of Ganxin206. The highest grain filling rate per1000-grain of Ganxin203was the treatment of JN, while that of Ganxin206was SL. Decreased range of the fertilized grain ratio under the delaying pollination for the JN treatment of Ganxin203was lower than that of Ganxin206, as suggested the stigma vigor holding period of Ganxin203was longer than that of Ganxin206under the treatment of JN. The difference of the all kinds of pollen type ratio by the TTC determined method between the JN treatment and the control of the two varieties was insignificant, as suggested the JN treatment had little effect on the pollen vigor. There was structure compensatory effects on yield per plant for double-season early hybrid rice, and there was some correlation between the yield potential of the variety and the compensatory ability. 2.late rice:The panicle length, total grains per panicle and1000-grain weight increased significantly under the treatment of JN, the seed-setting rate increased and1000-grain weight increased a little at the same time under the treatment of SF, while the seed-setting rate and1000-grain weight improved under the treatment of SL for the ChangyoulOhao, however they all decreased a little for the WufengyouT025. The yield per plant of SF was the highest, SL and JN the lowest for the WufengyouT025and Changyou10hao respectively, and the control were the middle in the all treatments of the two varieties, as suggested the structure compensation ability on yield per plant of double-season late hybrid rice was limited and the compensational modes inter the structures were different for the different varieties. The yield per plant of SF of WufengyouT025and Changyou10hao was15.49and2.70per cent higher than that of the control, SL was31.29and10.52per cent lower, JN was8.11and28.65per cent lower respectively, as suggested the structure compensation ability on yield per plant of WufengyouT025was stronger than that of Changyou10hao. JN treatment increased the differentiation and formation of the secondary branches and spikelets and decreased their degeneration for Changyou10hao, while the reverse for WufengyouT025. The leaf area and dry matter accumulation per plant of JN was clearly lower than that of the control, specific leaf weight higher, and the gap between the JN and the control of WufengyouT025was higher than that of Changyou10hao. The highest grain filling rate per panicle and per1000-grain of the two varieties were the JN and SL treatments respectively, and the gap between the treatment and the control of WufengyouT025was higher than that of ChangyoulOhao. Decreased range of the fertilized grain ratio under the delaying pollination for the JN treatment of the two varieties were all lower than that of the control, as suggested the stigma vigor holding period would be prolonged under the treatment of JN. The difference of the all kinds of pollen type ratio by the TTC determined method between the JN treatment and the control of the two varieties was insignificant, as suggested the JN treatment had little effect on the pollen vigor. There was structure compensation effects on yield per plant for double-season late hybrid rice, and there was some correlation between the yield potential of the variety and the compensation ability.