Taking the heterotic combinations which respectively had moderately-rolled leaves and flat leaves at middle and later stages as tested materials, the biological effects in the heterotic combination of the moderately-r...Taking the heterotic combinations which respectively had moderately-rolled leaves and flat leaves at middle and later stages as tested materials, the biological effects in the heterotic combination of the moderately-roiling leaf mutant RL（f） were studied. The results showed that （i） there was insignificant difference between the leaf morphological characteristics of the RL（t） and fiat leaf heterotic ombinations at early growth stage in that beth of them had fiat leaves and relatively big basic leaf angles; （it） the stomatal conductance, the intercellular CO2 concentration, transpira- tion rate and photosynthetic rate of the three top leaves of the RL（t） heterotic com- bination were significantly higher than those of the flat leaf heterotic combination at middle and later stages, which laid the foundation for increasing the yield per unit area; （iii） the light transmittance of the RL（f） heterotic combination in population at the middle part was higher than that of flat leaf heterotic combination, resulted in improved light interception condition at middle and lower parts of the population and increased the utilization efficiency of tight energy; and （iv） this research revealed that the RL（t） heterotic combination could not only maintain a larger amount of the effective panicles but also could present large-panicle characteristic, especially in high-density condition, and also the ability of adjusting yield components the RL（f） heterotic combination was significantly increased under different densities. This study would provide a theoretical basis for the principle of high-yielding breeding with the application of the moderately-rolling leaf mutant in rice.展开更多
Objective] The main biological effects of leaf rol ing of rice was studied to provide the theoretical basis for the application of RL （t） in the breeding of the rice. [Method] A rice mutant with adaxial y-rol ed lea...Objective] The main biological effects of leaf rol ing of rice was studied to provide the theoretical basis for the application of RL （t） in the breeding of the rice. [Method] A rice mutant with adaxial y-rol ed leaf was found in breeding, temporarily named as RL （t）. The differences were researched in which light interception struc-ture, light transmission photosynthetic efficiency and cel ular structure comparison between RL （t） and its sister lines that had flat leaf. [Result] Both leaf rol ing index and leaf erecting index of RL （t） were higher than those in 0731-3-1-1B. However, its basic leaf angle and leaf drooping angle were significantly lower than those in 0731-3-1-1B in upper three leaves, which caused a great raise in the photosynthetic rate on account of the light transmittance of RL （t）’s population were significantly higher than that of 0731-3-1-1B especial y the upper and middle part. The stomata conductance and the intercel ular CO2 concentration of the upper three leaves and transpiration rate of the flag and the second leaf were also significantly higher than that of 0731-3-1-1B. The bul iform cel s became smal er, leading to the rol ing up of leaves. [Conclusion] The study provided a theoretical basis for the principle of high-yielding breeding with the application of the adaxial y-rol ed leaf mutant in rice.展开更多
基金Supported by Chongqing Major Scientific and Technological Project(6887)Science and Technology Key Project of Chongqing Science and Technology Committee(CSTC,2009AB1061)~~
文摘Taking the heterotic combinations which respectively had moderately-rolled leaves and flat leaves at middle and later stages as tested materials, the biological effects in the heterotic combination of the moderately-roiling leaf mutant RL（f） were studied. The results showed that （i） there was insignificant difference between the leaf morphological characteristics of the RL（t） and fiat leaf heterotic ombinations at early growth stage in that beth of them had fiat leaves and relatively big basic leaf angles; （it） the stomatal conductance, the intercellular CO2 concentration, transpira- tion rate and photosynthetic rate of the three top leaves of the RL（t） heterotic com- bination were significantly higher than those of the flat leaf heterotic combination at middle and later stages, which laid the foundation for increasing the yield per unit area; （iii） the light transmittance of the RL（f） heterotic combination in population at the middle part was higher than that of flat leaf heterotic combination, resulted in improved light interception condition at middle and lower parts of the population and increased the utilization efficiency of tight energy; and （iv） this research revealed that the RL（t） heterotic combination could not only maintain a larger amount of the effective panicles but also could present large-panicle characteristic, especially in high-density condition, and also the ability of adjusting yield components the RL（f） heterotic combination was significantly increased under different densities. This study would provide a theoretical basis for the principle of high-yielding breeding with the application of the moderately-rolling leaf mutant in rice.
文摘Objective] The main biological effects of leaf rol ing of rice was studied to provide the theoretical basis for the application of RL （t） in the breeding of the rice. [Method] A rice mutant with adaxial y-rol ed leaf was found in breeding, temporarily named as RL （t）. The differences were researched in which light interception struc-ture, light transmission photosynthetic efficiency and cel ular structure comparison between RL （t） and its sister lines that had flat leaf. [Result] Both leaf rol ing index and leaf erecting index of RL （t） were higher than those in 0731-3-1-1B. However, its basic leaf angle and leaf drooping angle were significantly lower than those in 0731-3-1-1B in upper three leaves, which caused a great raise in the photosynthetic rate on account of the light transmittance of RL （t）’s population were significantly higher than that of 0731-3-1-1B especial y the upper and middle part. The stomata conductance and the intercel ular CO2 concentration of the upper three leaves and transpiration rate of the flag and the second leaf were also significantly higher than that of 0731-3-1-1B. The bul iform cel s became smal er, leading to the rol ing up of leaves. [Conclusion] The study provided a theoretical basis for the principle of high-yielding breeding with the application of the adaxial y-rol ed leaf mutant in rice.
