Biotechnology Bulletin ›› 2015, Vol. 31 ›› Issue (9): 97-105.doi: 10.13560/j.cnki.biotech.bull.1985.2015.09.013

• Research report • Previous Articles     Next Articles

Cloning and Function Analysis of Aquaporin Protein Gene sikPIP1 from Saussurea involucrata Kar. et Kir

Li Yushun, Liu Yiling, Liu Bucang, Mu Jianqiang, Zhu Jianbo   

  1. (Key Laboratory of Agricultural Biotechnology,College of Life Science,Shihezi University,Shihezi 8320003)
  • Received:2015-01-27 Online:2015-09-15 Published:2015-09-16

Abstract: Saussurea involucrata aquaporin protein gene sikPIP1 was cloned from established cDNA library by PCR technique. Then a plant expression vector of pBI121-sikPIP1 was constructed and transgenic tobacco plants were obtained by Agrobacterium-mediated method. The analysis by PCR and RT-PCR indicated that the aquaporin protein gene sikPIP1 had been integrated and transcribed into the tobacco genome. The drought and cold resistance by water stress and low-temperature stress for the positive plants from above PCR and RT-PCR examination were analyzed. The results showed that:(1)The plasma membrane aquaporin gene sikPIP1 was cloned with the length of 880 bp and complete ORF of 840 bp. (2)Under the water stress, the growth phenotype of transgenic tobacco was evidently better than wild-type after 7 days’ water-break, the results of physiological index showed that relative conductivity and MDA content of transgenic tobacco were lower than those of wild-type. However, the relative water content of transgenic tobacco was higher than that of wild-type. (3)The growth phenotype of transgenic tobacco was significantly better than that of wild-type under the different temperature stress. Especially below the 0 degree, the wild-type ones were wilting seriously, however, the transgenic tobacco had less damages. The results of physiological index showed that relative conductivity and MDA content of transgenic tobacco were lower than that of wild-type. The testing results showed that sikPIP1 gene improved tobacco's tolerance of drought and cold.

Key words: Sasussured involucrate, aquaporin protein, sikPIP1 gene, tobacco, drought tolerance, cold tolerance