Arid
DOI10.3732/ajb.1700282
Rapid root responses of seedlings exposed to a postdrought water pulse
Nguyen, Monica A.1; Larson, Julie E.1,2; Blair, Megan D.1; Hardwick, Darcy D.1; Khurana, Nilsha1; Kim, Joanne S.1; Rosenfield, Marc V.1; Funk, Jennifer L.1
通讯作者Nguyen, Monica A.
来源期刊AMERICAN JOURNAL OF BOTANY
ISSN0002-9122
EISSN1537-2197
出版年2017
卷号104期号:12页码:1816-1824
英文摘要

PREMISE OF THE STUDY: Mediterranean-type climate ecosystems experience significant variability in precipitation within and across years and may be characterized by periods of extreme drought followed by a brief, high-intensity precipitation pulse. Rapid root growth could be a key factor in effective utilization of precipitation pulses, leading to higher rates of seedling establishment. Changes in root growth rate are rarely studied, however, and patterns in seedling root traits are not well explored. We investigated the influence of an extreme postdrought precipitation event on seedlings that occur in southern California coastal sage scrub.


METHODS: We measured root elongation rate, root tip appearance rate, new leaf appearance rate, and canopy growth rate on 18 mediterranean species from three growth forms.


KEY RESULTS: Root elongation rate responded more strongly to the precipitation pulse than did root tip appearance rate and either metric of aboveground growth. The majority of species exhibited a significant change in root growth rate within 1 week of the pulse. Responses varied in rapidity and magnitude across species, however, and were not generally predictable based on growth form.


CONCLUSIONS: While the majority of species exhibited shifts in belowground growth following the pulse, the direction and magnitude of these morphological responses were highly variable within growth form. Understanding the implications of these different response strategies for plant fitness is a crucial next step to forecasting community dynamics within ecosystems characterized by resource pulses.


英文关键词coastal sage scrub drought Mediterranean-type climate ecosystems precipitation pulse pulse dynamics root elongation rate root tip appearance rate
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000418127200006
WOS关键词SEMIARID ECOSYSTEMS ; RESOURCE PULSES ; SOIL-MOISTURE ; GROWTH ; DROUGHT ; DESERT ; PLANT ; PRECIPITATION ; ENVIRONMENTS ; PLASTICITY
WOS类目Plant Sciences
WOS研究方向Plant Sciences
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/197243
作者单位1.Chapman Univ, Schmid Coll Sci & Technol, Orange, CA 92866 USA;
2.Univ Colorado, Dept Ecol & Evolutionary Biol, Boulder, CO 80309 USA
推荐引用方式
GB/T 7714
Nguyen, Monica A.,Larson, Julie E.,Blair, Megan D.,et al. Rapid root responses of seedlings exposed to a postdrought water pulse[J],2017,104(12):1816-1824.
APA Nguyen, Monica A..,Larson, Julie E..,Blair, Megan D..,Hardwick, Darcy D..,Khurana, Nilsha.,...&Funk, Jennifer L..(2017).Rapid root responses of seedlings exposed to a postdrought water pulse.AMERICAN JOURNAL OF BOTANY,104(12),1816-1824.
MLA Nguyen, Monica A.,et al."Rapid root responses of seedlings exposed to a postdrought water pulse".AMERICAN JOURNAL OF BOTANY 104.12(2017):1816-1824.
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