核农学报2017，Vol.31Issue(9)：1794-1802,9.DOI:10.11869/j.issn.100-8551.2017.09.1794
分蘖期干旱胁迫对寒地粳稻光合特性及产量形成的影响
Effect of Drought Stress at Tillering Stage on Photosynthetic Characteristics and Yield Formation of Cold-region Rice
摘要
Abstract
In order to investigate the mechanismof drought stress and drought tolerance at tillering stage on yield formation of cold-region rice,Songjing 6 (drought-sensitive) and Dongnong 425 (Drought-tolerant) were selected as test materials.Drought stress was started with the tillering stage,finished with 21 days after treatment,and the soil water potential was 0 kPa(control),-10 kPa(mild drought),-25 kPa(moderate drought),-40 kPa(sever drought),they were respectively recorded as A0,A1,A2,A3.The effects of different drought stress on photosynthetic characteristics,chlorophyll total content,leaf area,yield and its components of cold-region rice were investigated.The results showed that the leaf area,Pn,Tr,Gs and Ci all decreased with the soil water potential.Besides,during the period of drought treatment the content of chlorophyll,chlorophyll a/b ratio all decreased with the soil water potential,but the carotenoids was opposite.The yield of cold-region rice decreased significantly under drought stress,and the amplitude was opposite,of which the main reason is the significantly cut of effective panicle and spikelets numbers.It indicated that the cut of yield in cold-region rice was because the significant reduction of storage capacity and spikelets per unit area caused by low soil water potential.At the same time,compared with A0 the drop of yield in A1,A2 and A3 of Songjing 6 were 13.87％,20.87％ and 32.51％ respectively;while those of Dongnong 425 were 10.58％ 、15.21％ and 25.52％,which were significantly lower than Songjing 6.Moreover,drought-tolerant varieties Dongnong 425 remained stronger growth and photosynthetic capacity.Therefore,the test was aimed to find out the mechanism of yield formation of cold-region rice under drought stress and enrich the physiological basis of drought resistance of cold-region rice.In order to provide theoretical basis for the establishment of water saving cultivation techniques of cold-region rice.关键词
干旱胁迫/光合特性/产量/产量构成因素Key words
drought stress/photosynthetic characteristics/yield/yield components引用本文复制引用
于美芳,王新鹏,段云轩,田雪飞,贾琰,赵宏伟..分蘖期干旱胁迫对寒地粳稻光合特性及产量形成的影响[J].核农学报,2017,31(9):1794-1802,9.基金项目
国家重点研发计划项目(2016YFD0300104),黑龙江省重大科技招标项目(GA14B102-02) （2016YFD0300104）
