期刊
PLANTS-BASEL
卷 11, 期 21, 页码 -出版社
MDPI
DOI: 10.3390/plants11212986
关键词
chlorophyll; foliar absorption; foliar sprays; maize; phosphorus deficiency; phosphorus translocation; photosynthesis
资金
- Konrad-Adenauer Foundation
The study showed that foliar P application significantly increased photosynthesis and chlorophyll content in maize, as well as enhanced biomass production. However, the positive effects on CO2 assimilation and P concentration from foliar P application were transient and could not restore the functionality of P-deficient maize plants during a prolonged experimental period.
The essential plant nutrient phosphorus (P) is key for numerous structures and processes in crops and its deficiency can severely restrict yield and quality. As soil P availability for plant uptake is often limited, foliar P application can be an alternative means of supplying P to the plants during the growth period. This study was aimed at investigating the effect of foliar P application on photosynthetic parameters, P nutritional status, and growth of P deficient maize over time. Plants of Zea mays L. cv. Keops were grown with deficient and sufficient amounts of P in hydroponics. Foliar P treatments were applied to P deficient plants and several physiological parameters were monitored for 21 days. The variables measured were leaf gas exchange parameters, SPAD values, foliar P absorption, re-translocation rates, and plant biomass production. Foliar P application significantly increased CO2-assimilation and SPAD values and additionally enhanced biomass production in all plant components. Elemental analysis revealed increased tissue P concentrations following foliar P application compared to P deficient plants. While increased growth of P-deficient plants was steadily promoted by foliar P spraying for the entire experimental period, the positive effect on CO2 assimilation and P concentration was transient and vanished some days after the foliar treatment. P deficiency markedly impaired the efficiency of physiological processes of maize plants. As a conclusion, foliar P fertilisation improved physiological and agronomical plant parameters over time, but failed to restore plant functionality of P deficient maize plants during a prolonged experimental period.
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