caa a22 4500 445840714 CHVBK 20180317145343.0 cr unu---uuuuu 170323e20110401xx s 000 0 eng 10.1007/s00709-010-0172-2 doi (NATIONALLICENCE)springer-10.1007/s00709-010-0172-2 Expansin-regulated cell elongation is involved in the drought tolerance in wheat [Elektronische Daten] [Mei-rong Zhao, Feng Li, Ying Fang, Qiang Gao, Wei Wang] Water stress restrains plant growth. Expansin is a cell wall protein that is generally accepted to be the key regulator of cell wall extension during plant growth. In this study, we used two different wheat cultivars to study the involvement of expansin in drought tolerance. Wheat coleoptile was used as the material in experiment. Our results indicated that water stress induced an increase in acidic pH-dependant cell wall extension, which is related to expansin activity; however, water stress inhibited coleoptile elongation growth. The increased expansin activity was mainly due to increased expression of expansin protein that was upregulated by water stress, but water stress also resulted in a decrease in cell wall acidity, a negative factor for cell wall extension. Decreased plasma membrane H+-ATPase activity was involved in the alkalinization of the cell wall under water stress. The activity of expansin in HF9703 (a drought-tolerant wheat cultivar) was always higher than that in 921842 (a drought-sensitive wheat cultivar) under both normal and water stress conditions, which may be correlated with the higher expansin protein expression and plasma membrane H+-ATPase activity observed in HF9703 versus 921842. However, water stress did not change the susceptibility of the wheat cell wall to expansin, and no difference in this susceptibility was observed between the drought-tolerant and drought-sensitive wheat cultivars. These results suggest the involvement of expansin in cell elongation and the drought resistance of wheat. Springer-Verlag, 2010 Cell extension nationallicence Cell wall acidification nationallicence Expansin nationallicence Plasma membrane H+-ATPase nationallicence Water stress nationallicence Wheat coleoptile nationallicence PM : plasma membrane nationallicence PEG : polyethylene glycol nationallicence Zhao Mei-rong State Key Laboratory of Crop Biology, College of Life Science, Shandong Agricultural University, 271018, Tai'an, Shandong, People's Republic of China aut Li Feng State Key Laboratory of Crop Biology, College of Life Science, Shandong Agricultural University, 271018, Tai'an, Shandong, People's Republic of China aut Fang Ying State Key Laboratory of Crop Biology, College of Life Science, Shandong Agricultural University, 271018, Tai'an, Shandong, People's Republic of China aut Gao Qiang State Key Laboratory of Crop Biology, College of Life Science, Shandong Agricultural University, 271018, Tai'an, Shandong, People's Republic of China aut Wang Wei State Key Laboratory of Crop Biology, College of Life Science, Shandong Agricultural University, 271018, Tai'an, Shandong, People's Republic of China aut Protoplasma Springer Vienna 248/2(2011-04-01), 313-323 0033-183X 248:2<313 2011 248 709 https://doi.org/10.1007/s00709-010-0172-2 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00709-010-0172-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Zhao Mei-rong State Key Laboratory of Crop Biology, College of Life Science, Shandong Agricultural University, 271018, Tai'an, Shandong, People's Republic of China aut NATIONALLICENCE 700 1- Li Feng State Key Laboratory of Crop Biology, College of Life Science, Shandong Agricultural University, 271018, Tai'an, Shandong, People's Republic of China aut NATIONALLICENCE 700 1- Fang Ying State Key Laboratory of Crop Biology, College of Life Science, Shandong Agricultural University, 271018, Tai'an, Shandong, People's Republic of China aut NATIONALLICENCE 700 1- Gao Qiang State Key Laboratory of Crop Biology, College of Life Science, Shandong Agricultural University, 271018, Tai'an, Shandong, People's Republic of China aut NATIONALLICENCE 700 1- Wang Wei State Key Laboratory of Crop Biology, College of Life Science, Shandong Agricultural University, 271018, Tai'an, Shandong, People's Republic of China aut NATIONALLICENCE 773 0- Protoplasma Springer Vienna 248/2(2011-04-01), 313-323 0033-183X 248:2<313 2011 248 709 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer