文献类型：期刊文献

英文题名：EFFECT OF REGULATED DEFICIT IRRIGATION ON THE MORPHOLOGY, PHYSIOLOGY, CARBON ALLOCATION AND NONSTRUCTURAL CARBOHYDRATES OF THREE KENTUCKY BLUEGRASSES

作者：Liu, Jin Rong[1];Xie, Xiao Rong[2];Ma, Li[1];Liu, Yi Kai[1];Liu, Tie Jun[1];Lu, Jian Nan[1];Wang, Dang Ni[1]

第一作者：Liu, Jin Rong

通信作者：Liu, JR[1]

机构：[1]Lanzhou Univ, Coll Pastoral Agr Sci & Technol, State Key Lab Grassland Agroecosyst, Lanzhou 730020, Peoples R China;[2]Gansu Coll Tradit Chinese Med, Lanzhou 730020, Peoples R China

第一机构：Lanzhou Univ, Coll Pastoral Agr Sci & Technol, State Key Lab Grassland Agroecosyst, Lanzhou 730020, Peoples R China

通信机构：[1]corresponding author), Lanzhou Univ, Coll Pastoral Agr Sci & Technol, State Key Lab Grassland Agroecosyst, Lanzhou 730020, Peoples R China.

年份：2015

卷号：47

期号：6

起止页码：2247

外文期刊名：PAKISTAN JOURNAL OF BOTANY

收录：;Scopus(收录号：2-s2.0-84953301312);WOS:【SCI-EXPANDED(收录号:WOS:000372519800024)】；

基金：This research was supported by the National Natural Science Foundation of China (no. 31272487) and State Key Laboratory of Grassland Agro-ecosystems, College of Pastoral Agriculture, Science and Technology, Lanzhou University.

语种：英文

外文关键词：Drought; Recovery; Nonstructural carbohydrates; C-14 allocation

摘要：Regulated deficit irrigation (RDI) has been assessed in a wide number of field and fruit crops. However, few are the studies dealing with turfgrass. This study was conducted to investigate the morphology, physiology and carbon metabolic responses to regulated deficit irrigation for three Kentucky bluegrass (Poa pratensis L.) cultivars. Three Kentucky bluegrass cultivars were grown in PVC (polyvinyl chloride) tubes in a greenhouse and subjected to three soil water treatments in a growth chamber: 1) full irrigation; 2) drought stress, 21 days without water after full irrigation; and 3) drought recovery, stressed plants were re-watered for an additional 21 d. The present study indicated that drought resulted in a decline in turf quality (TQ), leaf relative water content (RWC), and photochemical efficiency (Fv/Fm) and an increase in electrolyte leakage (EL) for the cultivars. The turf quality, RWC, and Fv/Fm of the three Kentucky bluegrass cultivars increased with re-watering. The allocation of C-14 increased in the roots of these cultivars during the initial phase of drought stress, where a C-14 distribution shift from the roots to the stem and leaves appeared with further drought stress. Moreover, there was a significant accumulation of total nonstructural carbohydrates (TNC) in the leaves and stem. The TNC content in the leaves, stem, and roots did not completely return to the control levels following 21 d of re-watering, which was consistent with the recovery of TQ, RWC, Fv/Fm, and EL. In addition, during the re-watering treatment, the reduction in the TNC content may be due to increases in the demand or usage as a result of a rapid recovery in the growth and physiological activities as shown by increased TQ, RWC, and Fv/Fm and decreased EL. Our results suggested that the changes in the carbon allocation model and the accumulation and storage of TNC, as well as the changes in TQ, RWC, Fv/Fm, and EL, for the three cultivars are an adaptive reaction to drought and re-watering following drought. The accumulation and storage of TNC in plants during severe drought may contribute to the survival of meristematic regions and/or serve as reserves, which contribute to plant re-growth once the drought stress is alleviated. This result suggests that the allocation of carbon assimilates and their accumulation in different organs of turfgrass were a physiological adaptation response to drought and re-watering treatments, thus providing a scientific basis for further investigating the resistance of turfgrass to other adverse environments.