Rapid hydraulic recovery in Eucalyptus pauciflora after drought: linkages between stem hydraulics and leaf gas exchange

被引：127

作者：

Martorell, Sebastia ^{[1
,3
]}

Diaz-Espejo, Antonio ^{[2
]}

Medrano, Hipolito ^{[1
]}

Ball, Marilyn C. ^{[3
]}

Choat, Brendan ^{[3
,4
]}

机构：

[1] Univ Illes Balears, Grp Biol Plantes Cond Mediterranees, Palma De Mallorca 07122, Spain

[2] CSIC, IRNAS, Inst Recursos Nat & Agrobiol, Irrigat & Crop Ecophysiol Grp, E-41080 Seville, Spain

[3] Australian Natl Univ, Res Sch Biol, Plant Sci Div, Canberra, ACT 0200, Australia

[4] Univ Western Sydney, Hawkesbury Inst Environm, Richmond, NSW 2753, Australia

来源：

PLANT CELL AND ENVIRONMENT | 2014年 / 37卷 / 03期

基金：

澳大利亚研究理事会;

关键词：

cavitation; embolism; refilling; water stress; xylem; CONTRASTING PHYSIOLOGICAL-RESPONSES; WATER-STRESS; STOMATAL CONTROL; EMBOLISM REPAIR; LAURUS-NOBILIS; XYLEM EMBOLISM; WOODY-PLANTS; ANISOHYDRIC BEHAVIOR; VULNERABILITY; CAVITATION;

D O I：

10.1111/pce.12182

中图分类号：

Q94 [植物学];

学科分类号：

071001 ;

摘要：

In woody plants, photosynthetic capacity is closely linked to rates at which the plant hydraulic system can supply water to the leaf surface. Drought-induced embolism can cause sharp declines in xylem hydraulic conductivity that coincide with stomatal closure and reduced photosynthesis. Recovery of photosynthetic capacity after drought is dependent on restored xylem function, although few data exist to elucidate this coordination. We examined the dynamics of leaf gas exchange and xylem function in Eucalyptus pauciflora seedlings exposed to a cycle of severe water stress and recovery after re-watering. Stomatal closure and leaf turgor loss occurred at water potentials that delayed the extensive spread of embolism through the stem xylem. Stem hydraulic conductance recovered to control levels within 6h after re-watering despite a severe drought treatment, suggesting an active mechanism embolism repair. However, stomatal conductance did not recover after 10d of re-watering, effecting tighter control of transpiration post drought. The dynamics of recovery suggest that a combination of hydraulic and non-hydraulic factors influenced stomatal behaviour post drought.

引用

页码：617 / 626

页数：10

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