A comparison of the closely-related species Caragana intermedia and C. microphylla from Inner Mongolia to C. pruinosa and C. spinosa from Xinjiang was conducted to examine whether lowest predawn leaf water potential(Ψleaf) measured under severe drought stress was associated with variation in vein architecture(1°, 2°, 3° and minor vein density(t/b)3). The results showed that the lowest leaf water potential(Ψleaf) of C. intermedia and C. microphylla respectively was -6.0 MPa and -6.5 MPa, while C. pruinosa and C. spinosa respectively was -4.0 MPa and -4.4 MPa. The lowest water potential had no linear relation with 1° and 2° vein densities, while increasing with the 3°-order vein and minor vein densities; The lowest water potential incresed with the(t/b)3 of the ratio of conduit wall thickness to lumen diameter in 1°, 2°, 3° and minor vein. The research suggested that the increased density of tertiary veins, minor veins in Inner Mongolia species and the enhanced ability of minor veins to resist collapse promoted the decline of lowest water potential under leaf drought stress. compared with Caragana species growing in Xinjiang,
Yao Guangqian
,
Wei Yang
,
Bi Minhui
,
Nie Zhengfei
,
Fang Xiangwen
. Relationship between Leaf Vein Density and the Lowest Water Potential under Drought Stress in four Caragana Species[J]. Journal of Desert Research, 2018
, 38(6)
: 1252
-1258
.
DOI: 10.7522/j.issn.1000-694X.2017.00089
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