PJB-2016-212
EFFECTS OF SALT STRESS ON TILLERING NODES TO THE GROWTH
YU QIONG1,2, GUO YUAN1,2, XIE ZHIXIA1, SUN KE1, XU JIN3, YANG TING1,2, LIU XIAOJING1
Abstract
In monsoon climate regions, the tillering nodes of winter wheat can be stressed by high salt accumulation on the soil surface in spring, thereby leading to salt-induced damage. To understand whether tillering nodes could be stressed by salinity and to estimate its effects on the growth of winter wheat under salt stress, the tillering nodes of two wheat cultivars, H-4589 (salt-sensitive) and J-32 (salt-tolerant), were treated with salinity to investigate the physiological and biochemical changes in seedling growth. The results indicated that salt stress on tillering nodes significantly reduced plant height and shoot dry weight; increased Na+ accumulation, soluble sugar and proline in both H-4589 and J-32; which demonstrated remarkable effects on the growth of winter wheatwhen the tillering nodes were under salt stress. Furthermore, equivalent Na+ accumulations were discoveredin two cultivarswhen tillering nodes were under salt stress, while remarkably different Na+ accumulations were discoveredin two cultivars when roots were under salt stress. Based on the results from anatomic analyses, we speculated that no anatomic differences in tillering nodes between two cultivars could give reason to the equivalent Na+ accumulations in two cultivarswhen tillering nodes were under salt stress; and more lignified endodermis in primary roots as well as larger reduction of lateral root number in salt-tolerant cultivars which contributed to preventing Na+ influx could explain the remarkably lower Na+ accumulation in salt-tolerant cultivar when roots were under salt stress. All of these results indicated that the tillering nodes could mediate Na+ influx from the environment leading to salt-induced damage to the growth of winter wheat. Key word: Tillering nodes, Salt stress, Winter wheat, Na+ accumulation, Soluble sugar, Proline, Anatomic analysis.
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