Arid
DOI10.1111/gcbb.12322
Xylem morphology determines the drought response of two Arundo donax ecotypes from contrasting habitats
Haworth, Matthew1; Centritto, Mauro1; Giovannelli, Alessio1; Marino, Giovanni1; Proietti, Noemi2; Capitani, Donatella2; De Carlo, Anna1; Loreto, Francesco3
通讯作者Haworth, Matthew
来源期刊GLOBAL CHANGE BIOLOGY BIOENERGY
ISSN1757-1693
EISSN1757-1707
出版年2017
卷号9期号:1页码:119-131
英文摘要

Arundo donax exhibits rapid growth and requires little nutrient input, making it an ideal perennial biomass crop species. However, this growth is accompanied by high rates of water use, potentially restricting the use of A. donax in rain-fed marginal lands. Here, we investigated the physiological and morphological responses to drought in two ecotypes of A. donax from contrasting habitats: one from an arid environment in Morocco, and the second from a warm humid sub-Mediterranean climate in central Italy. Prolonged drought resulted in identical reductions in leaf-level photosynthesis (P-N) and stomatal conductance (G(s)) in the two ecotypes. However, water deficit induced an increase in xylem vessel diameter in the Moroccan plants, improving the movement of water along the stem, but also likely reducing the resistance to embolism. In contrast, the Italian ecotype reduced xylem vessel area, thus increasing resistance to water transport and xylem embolism. The increased xylem vessel size and associated vulnerability to embolism in the Moroccan plants may have contributed to an increase in the loss of leaf numbers, but also to higher relative water content (RWC) in the remaining leaves in comparison to the Italian ecotype, where a greater number of leaves persisted. Despite the Moroccan plants possessing stems with a lower basal area than their Italian counterparts, both ecotypes exhibited identical leaf to supporting stem area ratios under both control and water deficit conditions. This may account for the similarities observed in leaf area measures of P-N and G(s) in this and previous studies of different A. donax ecotypes. Selection of A. donax ecotypes on the basis of xylem responses to drought may facilitate the development of varieties suited to arid environments prone to severe drought and wetter habitats where prolonged droughts occur less frequently.


英文关键词biomass giant reed hydraulic conductivity marginal lands photosynthesis stomatal conductance xylem embolism
类型Article
语种英语
国家Italy
收录类别SCI-E
WOS记录号WOS:000390216800010
WOS关键词WATER-USE EFFICIENCY ; CARBON-ISOTOPE DISCRIMINATION ; LEAF GAS-EXCHANGE ; GIANT REED ; HYDRAULIC CONDUCTANCE ; PHOTOSYNTHETIC CAPACITY ; STOMATAL CONDUCTANCE ; WOODY-PLANTS ; L. CLONES ; MEDITERRANEAN ENVIRONMENT
WOS类目Agronomy ; Biotechnology & Applied Microbiology ; Energy & Fuels
WOS研究方向Agriculture ; Biotechnology & Applied Microbiology ; Energy & Fuels
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/199368
作者单位1.Natl Res Council CNR IVALSA, Tree & Timber Inst, Via Madonna del Piano 10 Sesto Fiorentino, I-50019 Florence, Italy;
2.Natl Res Council CNR IMC, Inst Chem Methodol, Area Ric Roma 1,Via Salaria Km 29,300, I-00015 Rome, Italy;
3.Natl Res Council CNR DiSBA, Dept Biol Agr & Food Sci, Piazzale Aldo Moro 7, I-00185 Rome, Italy
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GB/T 7714
Haworth, Matthew,Centritto, Mauro,Giovannelli, Alessio,et al. Xylem morphology determines the drought response of two Arundo donax ecotypes from contrasting habitats[J],2017,9(1):119-131.
APA Haworth, Matthew.,Centritto, Mauro.,Giovannelli, Alessio.,Marino, Giovanni.,Proietti, Noemi.,...&Loreto, Francesco.(2017).Xylem morphology determines the drought response of two Arundo donax ecotypes from contrasting habitats.GLOBAL CHANGE BIOLOGY BIOENERGY,9(1),119-131.
MLA Haworth, Matthew,et al."Xylem morphology determines the drought response of two Arundo donax ecotypes from contrasting habitats".GLOBAL CHANGE BIOLOGY BIOENERGY 9.1(2017):119-131.
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