分蘖盛期轻度雷电灾害对水稻SPAD值及产质量形成的影响

Effects of Lightning Disaster on SPAD Value and Yield and Quality Formation of Rice in High Tilling Period

在大田条件下,以垦稻12为材料,研究雷电灾害对水稻SPAD值及产质量形成的影响。结果表明:与常规相比,雷击后20 d内叶片SPAD值增加趋势明显,30 d后又逐渐恢复至常规。利用二次曲线和Richards生长模型分析表明,雷击后可以导致最终生长量(A)、起始生长势(R0)、平均灌浆速率(Gmean)、灌浆速率最大时的米粒重(Wmax)和最大灌浆速率(Gmax)值降低,而活跃灌浆期(D)和达最大灌浆速率的时间(Tmax)延长。此外,雷击还可以降低单株粒数、结实率、千粒重、谷草比和产量,降低稻谷的糙米率和精米率,增加收获期稻米的蛋白质含量和稻米直链淀粉含量。综合分析表明,分蘖期轻度雷电灾害会给水稻生产上带来不利影响,导致产量和稻米品质的下降。

Under field conditions,Kengdao 12 was used as material.The effects of lightning disaster on SPAD value and yield and quality of rice were studied.The results showed that the SPAD value of blades increased significantly within 20 days after lightning stroke,and gradually returned to normal after 30 days.Quadratic curve and Richards growth model analysis showed that lightning stroke could reduce final growth(A),initial growth potential(R0),average grouting rate(Gmean),grain weight at maximum filling rate(Wmax)and maximum grouting rate(Gmax),but prolong active grouting period(D)and time to maximum grouting rate(Tmax).In addition,lightning stroke can also reduce grain number per plant,seed setting rate,1000-grain weight,ratio of rice to straw and yield,reduce the brown rice rate and milled rice rate,and increase the protein content and amylose content of rice at harvest.Comprehensive analysis showed that lightning hazards at tillering stage would have adverse effects on rice production,resulting in the decline of rice yield and quality.