Different N Forms on Energy Allocation in Photosystem of Mulberry Seedlings Leaves

doi:10.11924/j.issn.1000-6850.casb15040131

Chinese Agricultural Science Bulletin ›› 2015, Vol. 31 ›› Issue (26): 18-25.doi: 10.11924/j.issn.1000-6850.casb15040131

Special Issue: 畜牧兽医

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Different N Forms on Energy Allocation in Photosystem of Mulberry Seedlings Leaves

Xu Nan^1,2,3,4, Zhong Haixiu^1,2,3, Sha Wei^1,2,3, Wu Yining^1,2,3, Zhang Huihui^1,2,3, Sun Guangyu⁴

(¹Institute of Nature Resource, Heilongjiang Academy of Sciences, Harbin 150040;²National and Provincial Joint Engineering Laboratory of Wetland and Ecological Conservation, Harbin 150040;³Key Laboratory for Wetland and Restoration Ecology in Heilongjiang Province, Harbin 150040;⁴College of Life Science, Northeast Forest University, Harbin 150040)

Received:2015-04-16 Revised:2015-04-27 Accepted:2015-05-04 Online:2015-09-23 Published:2015-09-23

Abstract

Abstract: Using forage mulberry (Morus alba L.) variety ‘Qinglong’ as experimental material, effects of nitrate and ammonium nitrogen proportion on Pn-PAR response curve and chlorophyll fluorescence parameters and electrons dissipation of mulberry seedlings cultured in hydroponics were investigated under the same nitrogen amount. The results showed that under normal atmospheric CO₂ concentration, some energy dissipated of mulberry seedlings by heat dissipation, when the NH₄-N:NO₃^--N was at 75:25 to 50:50, more energy was taken advantage by photochemical, and NO₃^--N increase led to the heat dissipation rise obviously. When NH₄-N:NO₃^--N was at 100:0, the value of J₀ reached the top, and then the value of J_cgot up to the top when NH₄-N:NO₃^--N was at 75:25. The distribution of excitation energy imbalance coefficient (β/α-1) declined to the minimum, while the distribution of excitation coefficient reached the balance. The (Ф_PSⅡ) got up to the top when the NH₄-N:NO₃^--N changed from 50:50 to 25:75, and the (Ф_NPQ) was at the minimum value. The study could provide the basis for appropriate nitrogen application in mulberry cultivation.

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Different N Forms on Energy Allocation in Photosystem of Mulberry Seedlings Leaves

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