Seasonal changes in carbohydrate accumulation for two creeping bentgrass cultivars
Seasonal changes in carbohydrate accumulation for two creeping bentgrass cultivars
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两个匍匐翦股颖品种碳水化合物积累的季节变化
DOI：
10.2135/cropsci2003.2660
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发表时间：
2003
期刊：
影响因子：
2.3
通讯作者：
Bingru Huang
中科院分区：
文献类型：
--
作者：
Qingzhang Xu;Bingru Huang
对照环境研究表明，匍匐弯草（Agrostis stolonifera var. palustris）的草坪质量下降。Farw。]与植物体内碳水化合物可用性的降低有关。本研究旨在研究和比较大田条件下耐热性不同的2个匍匐弯草品种‘Penncross’和‘L-93’碳水化合物状态和碳分配模式的季节变化。实验于1999年和2000年5月至11月进行。草在每天灌溉和修剪4毫米高度的绿化条件下进行管理。两个品种的草坪质量均从5月开始下降，8月和9月达到最低水平，10月恢复。两个品种的茎和根中总非结构性碳水化合物（TNC）、蔗糖和果聚糖的含量在两年内表现出与草坪质量相似的季节性特征。除2000年L-93幼苗外，夏季还原糖含量有所下降，但10月份没有恢复。两个品种碳水化合物含量的下降在根中比在茎中更明显。彭克罗斯的根系碳分配在夏季也有所减少。碳水化合物含量的品种差异在碳水化合物组分和年份之间不一致。在田间条件下，碳水化合物有效性的下降，特别是根系碳水化合物有效性的下降，以及夏季根系碳分配的限制可能导致品质下降；然而，碳水化合物含量的品种差异与两个品种间草坪质量下降的差异无关。
Controlled-environment studies suggest that turf quality decline of creeping bentgrass [Agrostis stolonifera var. palustris (Huds.) Farw.] under heat stress is associated with decreases in carbohydrate availability in plants. The study was designed to examine and compare seasonal changes of carbohydrate status and C allocation pattern for two creeping bentgrass cultivars, 'Penncross' and 'L-93', that differ in heat tolerance under field conditions. The experiment was conducted from May to November in 1999 and 2000. Grasses were managed under putting green conditions with daily irrigation and mowing at a 4-mm height. Turf quality of both cultivars declined from May and reached the lowest level in August and September, and recovered in October. The content of total nonstractural carbohydrates (TNC), sucrose, and fructans in shoots and roots exhibited a similar seasonal pattern as turf quality for both cultivars in both years. Reducing sugar content decreased during the summer, but did not recover in October, except in shoots of L-93 in 2000. The decreases in carbohydrate content were more pronounced in roots than in shoots for both cultivars. Carbon allocation to roots also decreased during summer for Penncross. Cultivar differences in carbohydrate content were not consistent between fractions of carbohydrate and times of the year. The decline in carbohydrate availability, particularly in roots, and limited C allocation to roots during summer could contribute to quality decline under field conditions; however, cultivar variation in carbohydrate content was not related to the differences in turf quality decline between two cultivars.