Multivariate associations of flavonoid and biomass accumulation in white clover (Trifolium repens) under drought

被引:45
作者
Ballizany, Wouter L. [1 ]
Hofmann, Rainer W. [1 ]
Jahufer, M. Z. Zulfiqhar [2 ]
Barrett, Brent A. [2 ]
机构
[1] Lincoln Univ, Fac Agr & Life Sci, Lincoln 7608, New Zealand
[2] AgRes Grasslands Res Ctr, Palmerston North 4442, New Zealand
关键词
abiotic stress; kaempferol; quercetin; secondary metabolism; UV-B RADIATION; AUXIN TRANSPORT; GLYCOSIDE ACCUMULATION; PATTERN-ANALYSIS; WATER-STRESS; RESPONSES; PHOTOSYNTHESIS; EXPRESSION; GROWTH; GENE;
D O I
10.1071/FP11193
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
White clover (Trifolium repens L.) is an important pasture legume in temperate regions, but growth is often strongly reduced under summer drought. Cloned individuals from a full-sib progeny of a pair cross between two phenotypically distinct white clover populations were exposed to water deficit in pots under outdoor conditions for 9 weeks, while control pots were maintained at field capacity. Water deficit decreased leaf water potential by more than 50% overall, but increased the levels of the flavonol glycosides of quercetin (Q) and the ratio of quercetin and kaempferol glycosides (QKR) by 111% and by 90%, respectively. Water deficit reduced dry matter (DM) by 21%, with the most productive genotypes in the controls showing the greatest proportional reduction. The full-sib progeny displayed a significant increase in the root : shoot ratio by 53% under water deficit. Drought-induced changes in plant morphology were associated with changes in Q, but not kaempferol (K) glycosides. The genotypes with high QKR levels reduced their DM production least under water deficit and increased their Q glycoside levels and QKR most. These data show, at the individual genotype level, that increased Q glycoside accumulation in response to water deficit stress can be positively associated with retaining higher levels of DM production.
引用
收藏
页码:167 / 177
页数:11
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