Controls on bud activation and tiller initiation in C3 and C4 tallgrass prairie grasses: the role of light and nitrogen

被引:18
作者
Williamson, Melinda M. [1 ]
Wilson, Gail W. T. [1 ]
Hartnett, David C. [2 ]
机构
[1] Oklahoma State Univ, Stillwater, OK 74078 USA
[2] Kansas State Univ, Div Biol, Manhattan, KS 66506 USA
来源
BOTANY-BOTANIQUE | 2012年 / 90卷 / 12期
基金
美国国家科学基金会;
关键词
bud banks; C-3; grasses; C-4; tiller recruitment; vegetative reproduction; perennial grasses; APICAL DOMINANCE; RESOURCE AVAILABILITY; MERISTEM LIMITATION; PLANT-POPULATIONS; PRECIPITATION; HYPOTHESIS; RESPONSES; QUALITY; GROWTH; BANKS;
D O I
10.1139/b2012-091
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Population dynamics of perennial grasses in tallgrass prairie ecosystems are strongly influenced by vegetative outgrowth from their belowground bud banks. We examined the role of light and nitrogen in regulating tiller initiation and tested an integrated model of controls on bud dormancy and activation in several C-3 and C-4 grasses. In addition, we assessed the interaction of nitrogen and light quantity and red - far red spectral composition on tiller initiation. Belowground perennating organs of three C-3 and three C-4 species were grown under full light or dark conditions, amended with one of four nitrogen concentrations (0 to 350 ppm N). Dormant buds were also subjected to full light under different spectral compositions or to continuous darkness. Our results among C-3 grasses support the integrated model as light and nitrogen played important and interacting roles in the regulation of bud banks. However, differences in responses among C-4 grasses and a lack of light x nitrogen interactions suggest that an alternative model may be necessary for this functional group. Our results provide predictions of responses to nitrogen enrichment or light imitations in prairie ecosystems due to interacting disturbances such as reduction in fire frequencies, alterations in grazing intensities, or climate change.
引用
收藏
页码:1221 / 1228
页数:8
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