Arid
DOI10.1093/aob/mcv136
Embryos of a moss can be hardened to desiccation tolerance: effects of rate of drying on the timeline of recovery and dehardening in Aloina ambigua (Pottiaceae)
Brinda, John C.1; Stark, Lloyd R.2; Clark, Theresa A.2; Greenwood, Joshua L.2
通讯作者Stark, Lloyd R.
来源期刊ANNALS OF BOTANY
ISSN0305-7364
EISSN1095-8290
出版年2016
卷号117期号:1页码:153-163
英文摘要

Background and Aims Embryonic sporophytes of the moss Aloina ambigua are inducibly desiccation tolerant (DT). Hardening to DT describes a condition of temporary tolerance to a rapid-drying event conferred by a previous slow-drying event. This paper aimed to determine whether sporophytic embryos of a moss can be hardened to DT, to assess how the rate of desiccation influences the post-rehydration dynamics of recovery, hardening and dehardening, and to determine the minimum rate of drying for embryos and shoots.


Methods Embryos were exposed to a range of drying rates using wetted filter paper in enclosed Petri dishes, monitoring relative humidity (RH) inside the dish and equilibrating tissues with 50 % RH. Rehydrated embryos and shoots were subjected to a rapid-drying event at intervals, allowing assessments of recovery, hardening and dehardening times.


Key Results The minimum rate of slow drying for embryonic survival was similar to 3.5 h and for shoots similar to 9h. Hardening to DT was dependent upon the prior rate of drying. When the rate of drying was extended to 22 h, embryonic hardening was strong (>50 % survival) with survival directly proportional to the post-rehydration interval preceding rapid drying. The recovery time (repair/reassembly) was so short as to be undetectable in embryos and shoots desiccated gradually; however, embryos dried in <3.5 h exhibited a lag time in development of similar to 4d, consistent with recovery. Dehardening resulted in embryos incapable of surviving a rapid-drying event.


Conclusions The ability of moss embryos to harden to DT and the influence of prior rate of drying on the dynamics of hardening are shown for the first time. The minimum rate of drying is introduced as a new metric for assessing ecological DT, defined as the minimum duration at sub-turgor during a drying event in which upon rehydration the plant organ of interest survives relatively undamaged from the desiccating event.


英文关键词Hardening dehardening inducible desiccation tolerance constitutive desiccation tolerance recovery sporophyte embryo bryophyte moss deacclimation rate of drying Aloina ambigua Pottiaceae
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000369996700013
WOS关键词RICCIA-FLUITANS L ; ABSCISIC-ACID ; PHYSCOMITRELLA-PATENS ; TORTULA-RURALIS ; DESERT MOSS ; WATER RELATIONS ; CHLOROPHYLL FLUORESCENCE ; CROSSIDIUM-CRASSINERVE ; POLYTRICHUM-FORMOSUM ; ATRICHUM-ANDROGYNUM
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/2XILL650/191275
作者单位1.Missouri Bot Garden, POB 299, St Louis, MO 63166 USA;
2.Univ Nevada, Sch Life Sci, 4505 Maryland Pkwy, Las Vegas, NV 89154 USA
推荐引用方式
GB/T 7714
Brinda, John C.,Stark, Lloyd R.,Clark, Theresa A.,et al. Embryos of a moss can be hardened to desiccation tolerance: effects of rate of drying on the timeline of recovery and dehardening in Aloina ambigua (Pottiaceae)[J],2016,117(1):153-163.
APA Brinda, John C.,Stark, Lloyd R.,Clark, Theresa A.,&Greenwood, Joshua L..(2016).Embryos of a moss can be hardened to desiccation tolerance: effects of rate of drying on the timeline of recovery and dehardening in Aloina ambigua (Pottiaceae).ANNALS OF BOTANY,117(1),153-163.
MLA Brinda, John C.,et al."Embryos of a moss can be hardened to desiccation tolerance: effects of rate of drying on the timeline of recovery and dehardening in Aloina ambigua (Pottiaceae)".ANNALS OF BOTANY 117.1(2016):153-163.
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