Abstract
Previous studies have found that once seedlings break the soil, light can induce the degradation of the key ethylene signaling element ethylene insensitive 3 (EIN3), so as to indirectly inhibit the synthesis of ethylene. Ethylene is the most important hormone in phosphorus absorption by plants, which induces the expression of acid phosphatase (APase) and phosphorus starvation response genes. Therefore, it might be speculated that changes in light intensity could regulate phosphorus absorption to some degree. However, there are few reports on the mechanism by which light intensity regulates phosphorus metabolism. In this study, the effects of different light intensities on phosphorus assimilation and metabolism in plants were studied. The results showed that relatively low light intensity could promote the secretion of APase, so as to increase the concentration of plant total phosphorus and cellular Pi. However, the low light intensity may also inhibit plant growth. Among the three species, oilseed rape was the most sensitive to the low light intensity. The steady-state level of the EIN3 protein decreased significantly under a relatively high light intensity; while the ethylene level also decreased under the high light intensity. Therefore, appropriate reductions in light intensity may simultaneously promote phosphorus assimilation and maintain plant growth.
Highlights
Accepted: 8 February 2022Phosphorus is an essential nutrient for plant metabolism and a crucial regulator of plant growth [1,2]
The shoot and root biomass of oilseed rape decreased with decreasing light intensity (Figure 1e,f), and the biomass of oilseed rape under the high light was significantly higher than that under the other two light treatments
The shoot and root biomass of oilseed rape decreased with decreasing light intensity (Figure 1e,f), and the biomass of oilseed rape under the high light was significantly higher of 14 than that under the other two light treatments
Summary
Accepted: 8 February 2022Phosphorus is an essential nutrient for plant metabolism and a crucial regulator of plant growth [1,2]. Phosphorus in the soil diffuses slowly, and cannot be absorbed and utilized by plants [3,4]. Previous studies have shown that plants exhibit a series of adaptive morphological changes to enhance phosphorus acquisition and utilization [5,6,7]. Oilseed rape is an important oil crop as well as a phosphorus-deficiency-sensitive crop [8,9]. Phosphorus deficiency seriously affects the yield, quality, and resistance of oilseed rape to environmental stresses. Maize and wheat are primary food crops, and are sensitive to phosphorus deficiency. Under low-phosphorus stress, the external morphology, absorption of nutrient elements, photosynthetic efficiency, and tillering of maize and wheat are all inhibited, resulting in significant reductions in both yield and quality [10,11,12,13]
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