Nitrogen(N),phosphorus(P)and potassium(K)are important essential nutrients for plant growth and development,but their functions in energy status remains unclear.Here,we grew Nipponbare rice seedlings in a growth chamb...Nitrogen(N),phosphorus(P)and potassium(K)are important essential nutrients for plant growth and development,but their functions in energy status remains unclear.Here,we grew Nipponbare rice seedlings in a growth chamber for 20 d at 30℃/24℃day/night)under natural sunlight conditions with different nutrient regimes.The results showed that N had the strongest influence on the plant growth and development,followed by P and K.The highest nonstructural carbohydrate content,dry matter weight,net photosynthetic rate(Pn),ATP content,as well as NADH dehydrogenase,cytochrome oxidase and ATPase activities were found in the plants that received sufficient N,P and K.The lowest values of these parameters were detected in the N-deficient plants.Higher dry matter accumulation was observed in the K-deficient than in the P-deficient treatments,but there was no significant difference in the ratio of respiration rate to Pn between these two treatments,suggesting that differences in energy production efficiency may have accounted for this result.This hypothesis was confirmed by higher ATP contents and activities of NADH dehydrogenase,cytochrome oxidase and ATPase in the K-deficient plants than in the P-deficient plants.We therefore inferred different abilities in energy production efficiency among N,P and K in rice seedlings,which determined rice plant growth and development.展开更多
The absolute photoionization cross section for the excited 7p state of K has been measured using the method of ionization saturation.The measured cross sections σ_(7p)(321.8nm)and σ_(7p)(643.6nm)are(0.9±0.6)Mb ...The absolute photoionization cross section for the excited 7p state of K has been measured using the method of ionization saturation.The measured cross sections σ_(7p)(321.8nm)and σ_(7p)(643.6nm)are(0.9±0.6)Mb and(1.9±0.9)Mb,respectively.The results are in good agreement with the calculated values.展开更多
The mean spin-rotation couplingγN of NaXe rnolecules is measmed by observing the sodium spin relaxation rate.It is in reasonable agreement with a recently presented theoretical expression.
基金This study was supported by the Zhejiang Provincial Natural Science Foundation,China(Grant Nos.LY19C130006 and LY20C130011)the Open Project Program of State Key Laboratory of Rice Biology,China(Grant No.20190403)+1 种基金the National Rice Industry Technology System,China(Grant No.CARS-01)and the Central Public Interest Research Institute Special Fund in China(Grant No.2017RG004-1).
文摘Nitrogen(N),phosphorus(P)and potassium(K)are important essential nutrients for plant growth and development,but their functions in energy status remains unclear.Here,we grew Nipponbare rice seedlings in a growth chamber for 20 d at 30℃/24℃day/night)under natural sunlight conditions with different nutrient regimes.The results showed that N had the strongest influence on the plant growth and development,followed by P and K.The highest nonstructural carbohydrate content,dry matter weight,net photosynthetic rate(Pn),ATP content,as well as NADH dehydrogenase,cytochrome oxidase and ATPase activities were found in the plants that received sufficient N,P and K.The lowest values of these parameters were detected in the N-deficient plants.Higher dry matter accumulation was observed in the K-deficient than in the P-deficient treatments,but there was no significant difference in the ratio of respiration rate to Pn between these two treatments,suggesting that differences in energy production efficiency may have accounted for this result.This hypothesis was confirmed by higher ATP contents and activities of NADH dehydrogenase,cytochrome oxidase and ATPase in the K-deficient plants than in the P-deficient plants.We therefore inferred different abilities in energy production efficiency among N,P and K in rice seedlings,which determined rice plant growth and development.
文摘The absolute photoionization cross section for the excited 7p state of K has been measured using the method of ionization saturation.The measured cross sections σ_(7p)(321.8nm)and σ_(7p)(643.6nm)are(0.9±0.6)Mb and(1.9±0.9)Mb,respectively.The results are in good agreement with the calculated values.
文摘The mean spin-rotation couplingγN of NaXe rnolecules is measmed by observing the sodium spin relaxation rate.It is in reasonable agreement with a recently presented theoretical expression.
