欢迎来到天天文库
浏览记录
ID:55148714
大小:27.00 KB
页数:5页
时间:2020-04-29
《水稻穗分化期不同土壤水势叶温及生理性状变化.doc》由会员上传分享,免费在线阅读,更多相关内容在应用文档-天天文库。
1、水稻穗分化期不同土壤水势叶温及生理性状变化 摘要:以水稻开粳1号为材料,研究不同土壤水势梯度下不同胁迫时间及复水处理对叶片温度、叶片生理指标的影响。结果表明,在白天不同测定时间内,各土壤水分胁迫下,随土壤水势的降低,叶片温度升高,但在试验处理梯度内,叶温均低于气温,各处理复水7d后叶温基本相同,且仍低于气温;在控水期间叶绿体色素含量降低,复水7d后叶绿体色素含量增加,轻度水分胁迫处理高于控水14d水平,重度水分胁迫高于控水7d水平,表现为补偿现象,15∶00时叶温与叶绿素a呈极显著负相关;丙二醛含量在轻度水分胁迫下先降低,复水后升高,但仍与控水初期水平相当,在
2、重度水分胁迫下先升高,复水后降低,但仍高于控水初期,13∶00时丙二醛含量与叶温呈极显著正相关,14∶00时呈显著正相关。 关键词:水稻;土壤水势;叶温;叶绿体色素;丙二醛 中图分类号:S511.2+2;Q945文献标识码:A文章编号:0439-811401-0033-04 LeafTemperatureandPhysiologicalTraitsofPanicleunderDifferentSoilWaterPotential ZHAOXiao-tong,HANYa-dong,GAOJi-ping,CHENJia,KONGXian-wei,ZH
3、ANGWen-zhong Abstract:Japonica1wasusedtostudyleaftemperatureandleafphysiologicalindicatorsunderdifferenttimeandrehydrationofdifferentwaterstressindifferentsoilwatergradient.Theresultsshowedthatwithloweringofsoilwaterpotential,theleaftemperatureincreasedunderdifferentsoilmoisture
4、stressduringthedaytime,butleaftemaperaturewaslowerthanairtemperature.Leaftemperaturesofalltreatmentswerethesameafter7days’rehydrationandstilllowerthanairtemperature.Thechlorophyllcontentdecreasedduringcontrollingthewater,butitincreasedafter7days’rehydrationwithmildwaterstresstreatmen
5、thigherthancontrollingwaterfor14days,andseverewaterstresstreatmenthigherthancontrollingwaterfor7days.Thisshowedakindofcompensationphenomenon.Leaftemperaturewasverysignificantlynegativelycorrelatedwithchlorophylla’scontentat15∶00pm.Undermildwaterstress,malondialdehydecontentdecreased,
6、butincreasedafterrehydrationandkeptatthesamelevelatthebeginningofcontrollingwater.Underseverewaterstress,malondialdehydecontentincreased,butdecreasedafterrehydrationandstillhigherthanthelevelatthebeginningofcontrollingwater.Malondialdehydecontentshowedhighlysignificantpositivecorrela
7、tionwithleaftemperatureat13∶00pmandsignificantpositivecorrelationat14∶00pm. Keywords:rice;soilwaterpotential;leaftemperature;chlorophyll;malondialdehyde 干旱是限制水稻生长的重要因子,以往确定干旱对水稻生长的影响程度,通常以丙二醛等生理指标的变化来衡量。近年来,随着红外测温技术的发展,以冠层温度变化来衡量干旱对作物生长影响的研究日益增多。前人在小麦、玉米、大豆和棉花等旱田作物上研究较多,发现冠层温度在不同
8、生态条件尤其在不同土壤水
此文档下载收益归作者所有