再生稻次适宜区迟播栽对不同杂交籼稻淀粉RVA谱的影响

为探讨再生稻次适宜区播栽期对杂交籼稻淀粉RVA谱的影响,以2个杂交籼稻品种,川优6203和宜香优2115为材料,在四川的隆昌和犍为2个生态点,研究不同生态条件下推迟播栽期对籼稻淀粉RVA谱特征值的影响。结果表明,播栽期的主效应对籼稻淀粉RVA谱特征值存在明显的影响。在再生稻次适宜区,推迟播栽期会导致水稻灌浆期温度降低,日照时长缩短,降雨量减少,从而降低了籼稻淀粉RVA谱的峰值黏度、热浆黏度、冷胶黏度和崩解值,提高了消减值以及峰值时间;与再生稻相比,迟播栽期处理具有较大的峰值黏度、崩解值以及较小的冷胶黏度、消减值、回复值、峰值时间和糊化温度。播栽期对籼稻淀粉RVA谱特征值的影响在不同生态点具有差异,与隆昌生态点相比,犍为生态点处理间的峰值黏度、消减值和崩解值差异更为显著。播栽期对不同品种淀粉RVA谱的影响程度不同,宜香优2115的峰值黏度和崩解值比川优6203更容易受到播栽期的影响。从淀粉RVA谱的变化趋势来看,迟播栽期处理的籼稻淀粉RVA谱表现与再生稻更为接近,蒸煮食味品质更高。

Effects of delayed sowing and planting date on starch RVA profiles of different indica hybrid rice in the sub-suitable region of ratoon rice

In order to explore the effect of sowing and planting date on the RVA profiles characteristics of indica hybrid rice,a two-factor split plot design with two indica hybrid rice varieties(Chuanyou 6203 and Yixiangyou 2115)and two sowing and planting date was conducted in Longchang and Qianwei in Sichuan province.The results showed that ecological condition,sowing and planting date,variety,and the interaction between sowing and planting date with ecological condition and variety had marked impact on the starch RVA profiles characteristic values of indica rice.In the sub-suitable region of ratoon rice,delayed sowing and planting date decreased the temperature,sunshine hours,and rainfall during grain filling period of rice,which resulted in the reduction in peak viscosity,hot paste viscosity,cool viscosity and breakdown viscosity,but increased in setback viscosity and peak time.Compared to ratoon rice,late sowing and planting date treatment increased peak viscosity and breakdown viscosity,and decreased cool viscosity,setback viscosity,consistence viscosity,peak time,and pasting temperature.The effect of sowing and planting date on the RVA spectrum of starch was different with ecological condition.Sowing and planting date leaded to greater variation in peak viscosity,setback viscosity,and breakdown viscosity in Qianwei compared with that of Longchang.Compared with Chuanyou 6203,sowing and planting date had greater influence on the peak viscosity and breakdown viscosity of Yixiangyou 2115.Overall,the starch RVA profiles characteristics of delayed sowing and planting date treatment was closer to the ratoon rice,which resulted in better cooking and eating quality of rice.