Genotypic variation for root traits of maize (Zea mays L.) from the Purhepecha Plateau under contrasting phosphorus availability

被引:97
作者
Bayuelo-Jimenez, Jeannette S. [1 ]
Gallardo-Valdez, Marin [2 ]
Perez-Decelis, Veronica A. [1 ]
Magdaleno-Armas, Lourdes [1 ]
Ochoa, Ivan [3 ]
Lynch, Jonathan P. [4 ]
机构
[1] Univ Michoacana, Inst Natl Invest Agr & Forestales, Tarimbaro 58800, Michoacan, Mexico
[2] Inst Nacl Invest Forestales Agr & Pecuarias, Campo Expt Uruapan 60500, Mexico
[3] Unipalma SA, Bogota, Colombia
[4] Penn State Univ, Dept Hort, University Pk, PA 16802 USA
关键词
Zea mays; Acid soil; Root architecture; Phosphorus efficiency; ARABIDOPSIS-THALIANA; ACQUISITION EFFICIENCY; GENETIC-VARIATION; HAIR LENGTH; SOIL; DEFICIENCY; LANDRACES; DENSITY; GROWTH; MEXICO;
D O I
10.1016/j.fcr.2011.01.001
中图分类号
S3 [农学(农艺学)];
学科分类号
0901 ;
摘要
Phosphorus (P) deficiency is a major constraint for maize production in many low-input agroecosystems. This study was conducted to evaluate genotypic variation in both root (root architecture and morphology, including root hairs) and plant growth traits associated with the adaptation of maize landraces to a P-deficient Andisol in two locations in the Central Mexican highlands. Two hundred and forty-two accessions from the Purhepecha Plateau, Michoacan were grown in Ponzomaran with low (23 kg P2O5 ha(-1)) and high (97 kg P2O5 ha(-1)) P fertilization under rain-fed field conditions, and subsequently a subset of 50 contrasting accessions were planted in the succeeding crop cycle in Bonilla. Accessions differed greatly in plant growth, root morphology and P efficiency defined as growth with suboptimal P availability. The accessions were divided into 3 categories of P efficiency using principal component and cluster analyses, and 4 categories according to the retained principal component and their relative weight for each genotype in combination with growth or yield potential. The distribution of accessions among three phosphorus efficiency classes was stable across locations. Phosphorus-efficient accessions had greater biomass, root to shoot ratio, nodal rooting, nodal root laterals, and nodal root hair density and length of nodal root main axis, and first-order laterals under P deficiency. Biomass allocation to roots, as quantified by the allometric partitioning coefficient (K) was not altered by P availability in the efficient accessions, but inefficient accessions had a lower K under low P conditions. Accessions with enhanced nodal rooting and laterals had greater growth under low P. Dense root hairs on nodal root main axes and first-order laterals conferred a marked benefit under low P. as evidenced by increased plant biomass. Late maturity improved growth and yield under low P. These results indicate that landraces of the Central Mexican highlands exhibit variation for several root traits that may be useful for genetic improvement of P efficiency in maize. (C) 2011 Elsevier B.V. All rights reserved.
引用
收藏
页码:350 / 362
页数:13
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