Arid
DOI10.1639/0007-2745-119.2.181
Propagula and shoots of Syntrichia pagorum (Pottiaceae) exhibit different ecological strategies of desiccation tolerance
Stark, Lloyd R.1,2; Brinda, John C.2; Greenwood, Joshua L.1
通讯作者Stark, Lloyd R.
来源期刊BRYOLOGIST
ISSN0007-2745
EISSN1938-4378
出版年2016
卷号119期号:2页码:181-192
英文摘要

We posed two questions regarding the desiccation tolerance (DT) of the moss Syntrichia pagorum: (1) What is the ecological strategy of DT in three available life phases (propagula, juvenile and adult shoots)? and (2) which desiccating factor, rate of drying or equilibrating relative humidity, has the greater effect on plant survival and health in these three life phases? Plants of S. pagorum were regenerated from an herbarium specimen collected from the American southwest, subcultured to remove field effects, and grown in Petri dishes on native sand for up to 6 months, producing in sequence juvenile shoots, adult shoots and propagula. Whereas juvenile shoots exhibited an ecological strategy of inducible desiccation tolerance (IDT), the propagula and adult shoots largely exhibited the strategy of constitutive desiccation tolerance (CDT). This conclusion was reached by subjecting each life phase to two rates of drying (20 min and 48 hours at subturgor) in combination with two equilibrating relative humidities (RH, 50% and,1%), and monitoring germination rate (propagula), visual leaf damage, and chlorophyll fluorescence (propagula and shoots) upon rehydration. We show for the first time that (1) cultured, dehardened adult shoots and propagula of a bryophyte are inherently CDT at an equilibrating RH of 50%, (2) rate of drying has a greater effect on rehydrated plant health than equilibrating RH, and (3) a bryophyte shoot can transition during normal development from one ecological strategy of desiccation tolerance to the alternative strategy.


英文关键词Bryophyte physiology inducible constitutive chlorophyll fluorescence cultured plants water content rate of drying dehardening equilibrating relative humidity phenotypic plasticity
类型Article
语种英语
国家USA
收录类别SCI-E
WOS记录号WOS:000381091600005
WOS关键词CHLOROPHYLL FLUORESCENCE ; CHEMICAL-COMPOSITION ; MOSS ; RECOVERY ; DESERT ; BRYOPHYTES ; MECHANISMS ; STRESS ; ECOPHYSIOLOGY ; CONSEQUENCES
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/2XILL650/191923
作者单位1.Univ Nevada, Sch Life Sci, 4505 Maryland Pkwy, Las Vegas, NV 89154 USA;
2.Missouri Bot Garden, POB 299, St Louis, MO 63166 USA
推荐引用方式
GB/T 7714
Stark, Lloyd R.,Brinda, John C.,Greenwood, Joshua L.. Propagula and shoots of Syntrichia pagorum (Pottiaceae) exhibit different ecological strategies of desiccation tolerance[J],2016,119(2):181-192.
APA Stark, Lloyd R.,Brinda, John C.,&Greenwood, Joshua L..(2016).Propagula and shoots of Syntrichia pagorum (Pottiaceae) exhibit different ecological strategies of desiccation tolerance.BRYOLOGIST,119(2),181-192.
MLA Stark, Lloyd R.,et al."Propagula and shoots of Syntrichia pagorum (Pottiaceae) exhibit different ecological strategies of desiccation tolerance".BRYOLOGIST 119.2(2016):181-192.
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