Summer dormancy in perennial temperate grasses

Volaire, F. and Norton, M. (2006) Summer dormancy in perennial temperate grasses. Annals of Botany, 98 5: 927-933. doi:10.1093/aob/mcl195


Author Volaire, F.
Norton, M.
Title Summer dormancy in perennial temperate grasses
Journal name Annals of Botany   Check publisher's open access policy
ISSN 0305-7364
0003-4754
1095-8290
Publication date 2006
Sub-type Critical review of research, literature review, critical commentary
DOI 10.1093/aob/mcl195
Volume 98
Issue 5
Start page 927
End page 933
Total pages 7
Place of publication London
Publisher Oxford University Press
Collection year 2006
Language eng
Subject C1
300200 Crop and Pasture Production
630202 Sown grasses
0607 Plant Biology
Abstract Background and Aims Dormancy has been extensively studied in plants which experience severe winter conditions but much less so in perennial herbaceous plants that must survive summer drought. This paper reviews the current knowledge on summer dormancy in both native and cultivated perennial temperate grasses originating from the Mediterranean Basin, and presents a unified terminology to describe this trait. Scope Under severe drought, it is difficult to separate the responses by which plants avoid and tolerate dehydration from those associated with the expression of summer dormancy. Consequently, this type of endogenous (endo-) dormancy can be tested only in plants that are not subjected to moisture deficit. Summer dormancy can be defined by four criteria, one of which is considered optional: (1) reduction or cessation of leaf production and expansion; (2) senescence of mature foliage; (3) dehydration of surviving organs; and (4, optional) formation of resting organs. The proposed terminology recognizes two levels of summer dormancy: (a) complete dormancy, when cessation of growth is associated with full senescence of foliage and induced dehydration of leaf bases; and (b) incomplete dormancy, when leaf growth is partially inhibited and is associated with moderate levels of foliage senescence. Summer dormancy is expressed under increasing photoperiod and temperature. It is under hormonal control and usually associated with flowering and a reduction in metabolic activity in meristematic tissues. Dehydration tolerance and dormancy are independent phenomena and differ from the adaptations of resurrection plants. Conclusions Summer dormancy has been correlated with superior survival after severe and repeated summer drought in a large range of perennial grasses. In the face of increasing aridity, this trait could be used in the development of cultivars that are able to meet agronomic and environmental goals. It is therefore important to have a better understanding of the genetic and environmental control of summer dormancy.
Keyword Dormancy
Drought
Perennial Grasses
Plant Survival
Induction
Dactylis Glomerata
Festuca Arundinacea
Phalaris Aquatica
Poa Bulbosa
Hordeum Bulbosum
Plant Sciences
Phalaris-aquatica L
Fescue Festuca-arundinacea
Dactylis-glomerata L
Poa-bulbosa L.
Drought Survival
Winter Hardiness
Gene-expression
Lolium-perenne
Water Status
Contrasting Cultivars
Q-Index Code C1

Document type: Journal Article
Sub-type: Critical review of research, literature review, critical commentary
Collections: 2007 Higher Education Research Data Collection
School of Agriculture and Food Sciences
 
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Created: Wed, 15 Aug 2007, 09:17:04 EST