Title : Variations of different wheat varieties to P stress: Is breeding a part of the solution for improving P use efficiency?
Nationwide, most agricultural areas for wheat production are limited by the low phosphorus (P) availability. In addition, the P use efficiency (PUE) for cereal crops rarely exceeds 16%. Thus, farmers usually apply P fertilizers in excess plant requirements rates. Breeding cultivars to grow under low phosphorus conditions may be beneficial to ensure global wheat production and increase
PUE. The main purpose of this study was to simulate soil with insoluble P to evaluate the ability of wheat varieties to uptake or utilize P and distinguish between P uptake efficiency and P utilization efficiency based on the different amounts of total P present in the soil. In a growth chamber, wheat cultivars were grown in coated sand with aluminum for 30 days. Results of this study proved the ability of some wheat varieties to uptake and/or utilize the unavailable P. Gallagher and Endurance were the most efficient varieties for both P uptake efficiency and P utilization efficiency. In addition, the Ok11755W was the most P utilization efficient, while OK10430-2 was consistently the most P uptake efficient. Other varieties evaluated in this study showed less efficiency under the condition of this study. The observation of this study proved the genetic variation among these varieties; further studies might be conducted based on this observation to identify genes responsible for elevating P uptake as a promising approach to increase P use efficiency under acidic soil conditions.