摘要
本研究旨在明确不同温型早籼稻气冠温差(CTD)与叶片光合及生理性状的关系,为快速筛选优质种质资源以及制定合理的栽培调控措施提供理论依据。选用低温型和高温型早籼稻品种各3个作为试验材料,在相同栽培管理措施下,监测孕穗期、抽穗期各品种冠层温度与大气温度,并测定叶片光合性状、叶绿素相对含量(SPAD)、超氧化物歧化酶(SOD)、过氧化氢酶(CAT)和过氧化物酶(POD)活性、丙二醛、可溶性糖及可溶性蛋白含量,以明确气冠温差与叶片光合及生理性状的关系。结果表明:与高温型品种相比,低温型品种有较高的净光合速率、气孔导度和蒸腾速率,可溶性糖和叶绿素含量也较高,且SOD、CAT、POD活性较强,丙二醛含量较低,但可溶性蛋白含量总体相差不大。相关性分析表明,早籼稻CTD与剑叶净光合速率、气孔导度、蒸腾速率呈显著正相关,与胞间CO2浓度呈负相关,但未达到显著水平。CTD与叶片可溶性糖含量,SPAD值和SOD酶活性显著正相关,与丙二醛含量呈显著负相关。
The objective of this study was to investigate the relationship of canopy temperature depression（CTD） and photosynthetic as well as physiological characteristics of early inbred rice varieties with differentcanopy temperatures, whereby providing theoretical bases for rapid screening of elite germplasms and makingreasonable cultivation measures. Using three low and high canopy temperature varieties grown under the samecondition of cultivation and management measures, the present study determined the canopy and atmospherictemperature at booting and heading stages, and investigated photosynthetic characteristics, chlorophyll relativecontent（SPAD）, superoxide dismutase（SOD）, catalase（CAT）, peroxidase（POD） activities, the contents ofmalonaldehyde, soluble sugars and soluble proteins, and then examined the relationship between CTD and leafphotosynthesis and physiological characteristics. Results showed that compared with high canopy temperaturevarieties, low canopy temperature varieties had higher net photosynthetic rates, stomatal conductance,transpiration rates, higher contents of soluble sugars and chlorophyll, and greater activities of SOD, CAT, andPOD, lower malonaldehyde content, but had no significant difference in soluble proteins. Correlation analysis indicated that CTD was significantly and positively related with net photosynthetic rates, stomatal conductanceand transpiration rates of the flag leaf, negatively correlated with the concentration of intercellular CO2, but notsignificantly. Canopy temperature depression was significantly and positively correlated with the content ofsoluble sugars, the SPAD value, and the activity of SOD, but was significantly and negatively correlated withthe content of malonaldehyde.
出处
《中国农学通报》
2015年第36期13-17,共5页
Chinese Agricultural Science Bulletin
基金
国家自然科学基金项目"籼型水稻品种冠层温度的分异及其与产量和耐热性的关系"(31260301)
江西省"555"领军人才项目
关键词
早籼稻
气冠温差
光合
生理性状
early inbred rice
canopy temperature depression
photosynthesis
physiological characteristics
