Effects of Water Deficits on Roots and Crown of Winter Wheat During Its Different Development Stages

doi:10.3321/j.issn:1000-7091.2001.04.015

Abstract

Abstract: Results of pot experiments showed that different water deficit degrees during dif ferent development stages of winter wheat had effect s on its roots and crown obviously. At stage of jointing to booting, when soil relative water content was 40% , reaching to the upper limit of water deficit , the plant heig ht decreased obviously and became shorter than that of no fertilizer treatment ck1, and it could not return to normal after supplying water. All droughts in different stages could make dry weight of roots and crown decreased, but not root length. Root length increased under certain water deficit , which depended on def icit degree. Roots were not as sensitive as crown to water deficit. Drought increased distribution ratio of nutritive matters in roots and prevented them from transporting to crown, which resulted in the increase of R/ C. In addit ion, as growth stage went on the effect of drought on R/ C became slighter.

Key words: Winter wheat, Development stage, Water def icit , R/ C

CLC Number:

S51.1+1

GUAN Xiujuan, ZHAO Shiwei, WANG Junzhen, LI Bicheng. Effects of Water Deficits on Roots and Crown of Winter Wheat During Its Different Development Stages[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2001, 16(4): 71-76. doi: 10.3321/j.issn:1000-7091.2001.04.015.

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