期刊
JOURNAL OF PLANT NUTRITION
卷 36, 期 10, 页码 1549-1564出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/01904167.2013.799184
关键词
nitrate; zeatin riboside; nitrogen metabolites; creeping bentgrass; heat stress
资金
- Virginia Agricultural Experiment Station
Heat stress reduces creeping bentgrass performance in temperate to sub-tropical climates. The research objective was to characterize effects of nitrogen (N) and cytokinin (CK) on creeping bentgrass under heat stress. In a 38 degrees C/28 degrees C chamber, grasses were treated with two nitrogen (2.5 and 7.5kg N ha(-1)) and three CK rates (0, 10 and 100M) biweekly. Grass grown at high N had better turf quality, higher photochemical efficiency (Fv/Fm), normalized difference vegetation index (NDVI), and chlorophyll concentration at d15 and 28 than low N. CK increased NDVI at d15, with Fv/Fm of the CK100 treatment being 18% higher than that of CK0 at d28. Under high N with 100M CK, root trans-zeatin riboside (tZR) and isopentenyl adenosine (iPA) were 160% and 97% higher than under low N without CK, respectively. These results demonstrate positive impacts of N and CK on creeping bentgrass under heat, with N playing a dominant role.
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