Wheat genotypes differing in aluminum tolerance differ in their growth response to CO2 enrichment in acid soils

被引：14

作者：

Tian, Qiuying ^{[1
]}

Zhang, Xinxin ^{[1
]}

Gao, Yan ^{[1
]}

Bai, Wenming ^{[1
]}

Ge, Feng ^{[2
,3
]}

Ma, Yibing ^{[4
]}

Zhang, Wen-Hao ^{[1
,3
]}

机构：

[1] Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China

[2] Chinese Acad Sci, Inst Zool, State Key Lab Integrated Management Pest Insects, Beijing 100093, Peoples R China

[3] Chinese Acad Sci, Beijing Inst Life Sci, Res Network Global Change Biol, Beijing 100093, Peoples R China

[4] Chinese Acad Agr Sci, Inst Agr Resources & Reg Planning, Natl Soil Fertil & Fertilizer Effects Long Term M, Beijing 100081, PR, Peoples R China

来源：

ECOLOGY AND EVOLUTION | 2013年 / 3卷 / 06期

关键词：

Acid soils; Aluminum tolerance; elevated CO2; growth response; malate efflux; wheat (Triticum aestivum L; ATMOSPHERIC CARBON-DIOXIDE; ELEVATED CO2; ROOT APICES; PLANTS; PHOSPHORUS; TOXICITY; LIMITATION; RESISTANCE; EXUDATION; STRESS;

D O I：

10.1002/ece3.559

中图分类号：

Q14 [生态学（生物生态学）];

学科分类号：

071012 ; 0713 ;

摘要：

Aluminum (Al) toxicity is a major factor limiting plant growth in acid soils. Elevated atmospheric CO2 [CO2] enhances plant growth. However, there is no report on the effect of elevated [CO2] on growth of plant genotypes differing in Al tolerance grown in acid soils. We investigated the effect of short-term elevated [CO2] on growth of Al-tolerant (ET8) and Al-sensitive (ES8) wheat plants and malate exudation from root apices by growing them in acid soils under ambient [CO2] and elevated [CO2] using open-top chambers. Exposure of ET8 plants to elevated [CO2] enhanced root biomass only. In contrast, shoot biomass of ES8 was enhanced by elevated [CO2]. Given that exudation of malate to detoxify apoplastic Al is a mechanism for Al tolerance in wheat plants, ET8 plants exuded greater amounts of malate from root apices than ES8 plants under both ambient and elevated [CO2]. These results indicate that elevated [CO2] has no effect on malate exudation in both ET8 and ES8 plants. These novel findings have important implications for our understanding how plants respond to elevated [CO2] grown in unfavorable edaphic conditions in general and in acid soils in particular.

引用

页码：1440 / 1448

页数：9