出 处:《应用与环境生物学报》2022年第6期1415-1421,共7页Chinese Journal of Applied and Environmental Biology
基 金:国家重点研发计划项目(2017YFD0100201);四川省科技计划项目(2021ZHFP0126,2021YFN0049)资助。
摘 要:以B优268(弱光敏感型)、内5优768(中间型)和宜香优1108(弱光耐受型)3个水稻品种为试验材料,通过比较正常光照(CK)和弱光处理(SH)的水稻产量和品质,明确不同水稻对弱光胁迫的响应.结果表明:(1)与正常光照相比,弱光处理下的宜香优1108千粒重、穗着粒数和结实率降幅远低于内5优768和B优268,且宜香优1108产量降幅(46.5%)显著低于内5优768(56.5%)和B优268(69.8%);即宜香优1108千粒重、结实率、穗着粒数和产量对弱光胁迫均表现较强的耐受性.(2)与正常光照相比,弱光处理下宜香优1108谷粒长、宽降低幅度显著大于B优268,但长宽比降低幅度并未达到显著水平,水稻直链淀粉含量和胶稠度均显著降低,其中宜香优1108直链淀粉下降程度(24.5%)显著低于内5优768(28.1%)和B优268(30.6%),但其胶稠度降幅(14.7%)显著大于内5优768(9.8%)和B优268(8.1%);弱光处理后,稻米RVA曲线特征值均发生了改变,宜香优1108、内5优768和B优268峰值黏度、崩解值显著下降,但冷胶粘度、消减值均显著升高,而峰值时间和糊化温度并未形成显著性差异.本研究表明弱光胁迫下水稻千粒重、穗着粒数和结实率等指标的响应可以作为耐弱光水稻材料选育的产量指标,稻米粒型、直链淀粉和胶稠度以及RVA特征值中峰值黏度和热浆黏度等可以作为耐弱光水稻材料选育的品质指标.(图5表2参30)In this study, three rice varieties, Byou268(low light-sensitive type), Nei5you768(intermediate type),and Yixiangyou1108(low light-tolerant), were used as experimental materials to investigate the yield and quality responses of different rice varieties to low light stress under normal light(CK) and low light(SH). The results showed the following:(1) Compared with normal light, the decrease in Yixiangyou1108’s 1 000-grain weight, grain number per spike, and seed setting rate under low light treatment were much lower than those of Nei5you768 and Byou268. The yield decline of Yixiangyou1108(46.5%) was significantly lower than that of Nei5you768(56.5%) and Byou268(69.8%). Yixiangyou1108 showed strong tolerance to low light stress in terms of 1 000-grain weight, seed setting rate, grain number per panicle, and yield.(2) Compared with normal light,the reduction in grain length and width of Yixiangyou1108 under low-light treatment was significantly greater than that of Byou268;however, the reduction in the length-width ratio did not reach a significant level. The amylose content and gel consistency of the rice were significantly reduced. The reduction in amylose content of Yixiangyou1108(24.5%) was significantly lower than that of Nei5you768(28.1%) and Byou268(30.6%);however,the decrease in gel consistency of Yixiangyou1108(14.7%) was significantly higher than that of Nei5you768(9.8%) and Byou268(8.1%). After low light treatment, the characteristic values of the RVA curve of rice changed.The peak viscosity and breakdown viscosity of Yixiangyou1108, Nei5you768, and Byou268 were significantly decreased, but the cold glue viscosity and setback viscosity were significantly increased, while there was no significant difference in the peak time and peak temperature. The response of 1 000-grain weight, grain number per spike, and seed setting rate under low light stress can be used as a yield index of rice breeding with low light tolerance;rice grain type, amylose, and gel consistency;and peak viscosity and hot paset viscosit
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...
正在载入数据...