文献类型：期刊文献

英文题名：Inter-ramet Photosynthate Translocation in Buffalograss under Differential Water Deficit Stress

作者：Qian, Yongqiang[1] Li, Deying[2] Han, Lei[1] Sun, Zhenyuan[1]

第一作者：钱永强

通信作者：Sun, ZY[1]

机构：[1]Chinese Acad Forestry, Key Lab Tree Breeding & Cultivat, State Forestry Adm, Res Inst Forestry, Beijing 100091, Peoples R China;[2]N Dakota State Univ, Dept Plant Sci, Fargo, ND 58108 USA

年份：2010

卷号：135

期号：4

起止页码：310-316

外文期刊名：JOURNAL OF THE AMERICAN SOCIETY FOR HORTICULTURAL SCIENCE

收录：;Scopus(收录号：2-s2.0-77954944561);WOS:【SCI-EXPANDED(收录号:WOS:000280061000003)】；

基金：This research was supported by the Hi-Tech Research and Development (863) Program of China (2007AA100105 and 2006AA100109) and by the Special Natural Science Fund for Non-for-profit National Institutions (RIF2010-11).

语种：英文

外文关键词：Buchloe dactyloides; clonal; physiological integration; turfgrass; ecology

摘要：Understanding the effect of photosynthate translocation on the shoot density of buffalograss (Buchloe dactyloides) is very important to improve its turf quality. The objective of this study was to examine the effects of water stress on water transport patterns, endogenous hormone distribution and allocation, and photosynthate allocation for connected buffalograss ramets. Clones from a single parent plant of 'Texoka' buffalograss were used to generate three-ramet units. Ramets are members of a clone that are not independent from the parent plant. Each water stress treatment had one of the three ramets cultured in half-strength Hoagland solution with 30% of polyethylene glycol (PEG) of 1.2 MPa psi(s), while the other two ramets were kept in half-strength Hoagland solution with psi(s) of -0.05 MPa. Results indicated that inter-ramet water integration happened when one of the connected ramets was under water stress. Transzeatin riboside content decreased in roots treated with PEG. Abscisic acid content increased in the roots of all treatments compared with the control. Water stress caused a reduction of indole-3-acetic acid content in shoots and roots, especially the ramet stressed. Gibberellic acid content in shoots and roots of all treatments increased compared with the control. Within the control, young ramets were sinks of photosynthate, but translocation toward older ramets was detected using (CO2)-C-14 label when the older ramet was under stress. Xylem, phloem, and parenchyma cells were probably involved in the physiological integration of these responses. Fates of connected clonal ramets of buffalograss were interrelated and the agronomic significance of this result should be evaluated further.