Abstract
Phosphorus (P) deficiency in Pakistani soils severely limits the crop production, hence,
the development of P-efficient cultivars seems inevitable to uphold the productivity of
P-impoverished agricultural systems. Ten wheat genotypes (AA-V1, AA-V2, AA-V3,
MSH-3, MSH-5, BWQ-4, EST-28/11, EST-29/9, ESW-9525 and NIA-Sunder) were
evaluated for P-efficiency and responsiveness under two phosphorus levels viz., 20 and
200 µM in hydroponic culture. Completely randomized design with two way factorial
arrangement was used and the treatments were replicated five times. Seven days old
seedlings were shifted to solution culture and grown for four weeks after transplanting.
The plants were then harvested for recording growth and phosphorus related attributes.
Low P level markedly reduced shoot and root dry weight, P concentration and
accumulation in wheat genotypes. However, P utilization index of shoot and root were
improved by 30 and 13% at low P supply. Shoot P utilization index was positively
correlated (r > 0.43; n = 50) with shoot dry weight and shoot P accumulation at both P
levels. Genotypes were grouped into four classes by regressing shoot dry weight at low
P level and physiological P-use efficiency. Genotypes AA-V3 and NIA-Sunder were
categorized as efficient and responsive (ER) genotypes, while AA-V1, BWQ-4 and
EST-28/11 were identified as efficient but non-responsive (ENR). Genotypes AA-V2
and MSH-5 formed the non-efficient but responsive (NER) group. Non-efficient and
non-responsive (NENR) category included MSH-3, EST-29/9 and ESW-9525. The
results of present study indicated that AA-V3 and NIA-Sunder were the most Pefficient and responsive genotypes as they have the potential to yield more under
varying levels of P availability. However, the results should be confirmed under filed
conditions.
Muhammad Abbas, Muhammad Irfan, Javaid Ahmed Shah, Muhammad Yousuf Memon. (2018) Intra-specific variations among wheat genotypes for phosphorus use efficiency, Asian Journal of Agriculture and Biology, Volume 6, Issue 1.
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