甘薯离体叶片失水速率及渗透调适物质与品种抗旱性的关系.pdfVIP

中国农业科学 2004,37(1);152一156 ScienliaA;rlcattaraSuuea 甘薯离体叶片失水速率及渗透调节物质与 品种抗旱性的关系 张明生’,2彭忠华2谢 波2，谈 锋3，张启堂3，付玉凡，，杨春贤3，杨永华’ (’南京大学生命科学学院，南京 210093’贵州大学农学院，周阳 550025;3西南师范人学生命科学学院，重庆 400715) 摘要:对水分胁迫下甘薯离体叶片失水速率和叶片渗透调节物质与品种抗旱性关系的研究表明，水分胁迫F 不同甘薯品种离体叶片失水速率比对照均明显减It;叶片中可溶性糖含量和游离氨塞酸总量比对照均明显增加， K一含量明显下降，游离脯氮酸含量有不同程度的增加。叫一片中可溶性糖、总游离氨参酸和K一的相对值(占对 照%)与品种抗旱性均呈极显著正相关 〔;分别为0.9374,0.9229和0.8359,P0.01);离体叶片失水速率的相对值 与品种抗旱比呈显著负相关(r=一。5450,P0.05);而游离脯氨酸的相对值与品种抗早性间约和关性不显著( =0.2583,P=0.3526),因此，除游离脯氛酸外，其余指标均可用于It薯品种抗旱性的评定 关键词:甘薯;水分胁迫;离体叶片失水速率;渗透ill节物质;抗旱性 绪石 八 RelationshipBetweenWaterLossRateofCuttingLeavesandOsmotic RegulatorsUnderWaterStressandDroughtResistanceinSweetPotato ZHANGMing-shenpl2,PENG XIE Bog,TANFen扩，ZHANGQi-tang Zhong-hua, FuYu-fanYANGChunxtxn ，YANGYong-hua (CollegeofLfieScience,NanjirtgUiimeroty,Nanjing210093;AgriculturalCollege,GuizhouUniversity Guiyang550025;Collegeo(LijeScience,SouthwestChinaNormal(Jniversity,Choaggiog400715) Abstract:Therelationshipbetweenwaterlossrateofcuttingleavesandosmoticregulatorsunderwaterstressand droughtresistanceofdifferentsweetpotatovarietieswasstudied,Theresultsshowedthatthewaterlossrateofcutting leavesallsloweddown.Solublesugarandtotalfreeaminoacidcontentsinsweetpotatoleavesallincreased,butKcon- tentdecreasedobviously,andtheirrelativecontentscorrelatedsignificantlypositively(rwere0.9374,0.9229and 0.8359respectively,P0.01)todroughtresistance.Therelativevaluesofwaterlossrateofcuttingleavescorrelated significantlynegatively(rwas一0.5450,P0.05).Freeprolinecontentin