Phosphorous Efficiency and Tolerance Traits for Selection of Sorghum for Performance in Phosphorous-Limited Environments

Crop Science

Leiser, Willmar L.²  Rattunde, H. Frederick W.⁴  Diallo, Abdoulaye³  Weltzien, Eva⁴  Toure, Abocar³  Haussmann, Bettina I.G.⁵  Piepho, Hans-Peter¹ 

[1] Institute of Crop Science, Bioinformatics Unit, Univ. of Hohenheim, 70593 Stuttgart, Germany$$;State Plant Breeding Institute, Univ. of Hohenheim, 70593 Stuttgart, Germany$$;L’Institut d’Economie Rurale, Bamako, Mali$$;International Crops Research Institute for the Semi-Arid Tropics, BP 320 Bamako, Mali$$;Institute of Plant Breeding, Seed Science and Population Genetics, Univ. of Hohenheim, 70593 Stuttgart, Germany$$

关键词: Burgess Shale;    Naraoia;    trilobites;    gills;    exopod;    functional morphology;   

DOI  :  10.2135/cropsci2014.05.0392

学科分类：农业科学（综合）

来源: Crop Science

【 摘 要 】

Sorghum (Sorghum bicolor (L.) Moench) is widely cultivated in West Africa (WA) on soils with low phosphorus (P) availability. Large genetic variation for grain yield (GY) under low-P conditions was observed among WA sorghum genotypes, but information is lacking on the usefulness of P-tolerance ratios (relative performance in –P [no P fertilizer] vs. +P [with P fertilizer] conditions) and measures of P-acquisition and internal P-use efficiency as selection criteria for enhancing GY under low-P conditions. We evaluated 70 WA sorghum genotypes for GY performance under −P and +P conditions for 5 yr in two locations in Mali and assessed P acquisition (e.g., P content in biomass) and P-use efficiency (e.g., grain produced per unit P uptake) traits under −P and +P conditions in one site in 2010. Significant genetic variation existed for all P-tolerance ratios across multiple sites. Photoperiod-sensitive landrace genotypes showed significantly better P tolerance and less delay of heading under P-limited conditions compared with photoperiod-insensitive varieties. Genotypic correlations of P-tolerance ratios to GY under −P were moderate. Phosphorous acquisition and P-use efficiency traits independent of harvest index were of similar importance for GY under −P conditions in statistically independent trials. However grain-P and stover-P concentrations from one −P trial showed only weak correlations with GYs in statistically independent trials. Highest predicted gains for −P GY were obtained by theoretical index selection based on −P GY combined with P-use efficiency traits (e.g., low-grain P concentration). Such index selection is expected to achieve both increased sorghum productivity and P sustainability in the P-limited WA production systems.

【 授权许可】

Unknown