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《Journal of Southwest Agricultural University》 2006-01
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EFFECT OF A GENE ACTIVATOR ON TRANSPIRATION RATE AND WATER USEEFFICIENCY OF SWEET POTATO

TANG Shao-hu,ZHOU Qi-gui,LI Kun-pei,LI Deng-yuan(School of Life Science,Southwest University,Chongqing 400715,China)  
A newly developed gene activator diluted 375,750 and 1 500 times,designated as A_1,A_2 and A_3,was used to treat purple sweet potato(Ipomoen batata Lam.) plants at four periods: dipping the basal part of the seed stem for 1 h(B_1) or foliar-spraying it at one-month intervals(B_2,B_3 and B_4).One month after the third spray,photosynthetic rate,transpiration rate(Tr) and water use efficiency(WUE) of the treated plants were determined.Treatment A_1 decreased Tr by 1.36% while Treatments A_2 and A_3 increased Tr by 18.10% and 16.93%,respectively.A_1,A_2 and A_3 increased WUE by 28.30%,8.41% and 5.94%,respectively.Treatments made in the four periods B_1,B_2,B_3 and B_4 increased Tr by 13.84%,5.23%,11.27% and 14.55% and increased WUE by 9.85%,21.64%,11.19% and 14.27%,respectively,a significant difference(P0.05) as compared with the untreated control.A_1B_2 appeared to be the optimum combination,with a 9.79% decrease in Tr and a 49.45% incr4ase in WUE as compared with the control.It is thus recommended that the basal part of the seed stem be dipped for 1 h and foliar sprayed once with this gene activator diluted by 375 times.
【Fund】: 重庆市科委攻关资助项目(2003-7864)
【CateGory Index】: S531
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