不同氮素形态配比对饲料桑幼苗叶片叶绿素荧光特性和能量分配的影响

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

中国农学通报 ›› 2015, Vol. 31 ›› Issue (26): 18-25.doi: 10.11924/j.issn.1000-6850.casb15040131

所属专题：畜牧兽医

不同氮素形态配比对饲料桑幼苗叶片叶绿素荧光特性和能量分配的影响

许楠^1,2,3,4,钟海秀^1,2,3,沙威^1,2,3,伍一宁^1,2,3,张会慧⁴,孙广玉⁴

(¹黑龙江省科学院自然与生态研究所,哈尔滨 150040；²湿地与生态保育国家地方联合工程实验室,哈尔滨 150040；³黑龙江省湿地与恢复生态学重点实验室,哈尔滨 150040；⁴东北林业大学生命科学学院,哈尔滨 150040）

收稿日期:2015-04-16 修回日期:2015-04-27 接受日期:2015-05-04 出版日期:2015-09-23 发布日期:2015-09-23
通讯作者: 孙广玉
基金资助:
国家科技支撑项目(2011BAD08B02-3)；黑龙江省自然科学基金重点项目(ZD201105)。

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

摘要/Abstract

摘要： 为研究饲料桑‘青龙’幼苗叶片光合电子传递和分配对NH₄⁺-N和NO₃^--N不同形态氮配比的响应，以不同氮素形态配比为处理手段，通过测定饲料桑‘青龙’幼苗叶片的净光合速率响应曲线、以及荧光参数来测算光合电子传递速率和分配去向。结果表明，正常大气CO₂浓度[380 μmol/(m²·s)]处理下，饲料桑‘青龙’幼苗叶片较多的激发能以热量的形式耗散，n(NH₄⁺-N):n(NO₃^--N)为75:25至50:50时可使更多的激发能向光化学反应方向的分配，降低光合能量的热耗散速率，NO₃^--N浓度增加使激发能以热量的形式耗散增加；n(NH₄⁺-N):n(NO₃^--N)为100:0时饲料桑‘青龙’幼苗叶片参与光呼吸的非环式电子流速率(J₀)最高，随着n(NH₄⁺-N):n(NO₃^--N)为75:25时饲料桑‘青龙’幼苗叶片参与碳同化的非环式电子流速率J_c也升至最高。n(NH₄⁺-N):n(NO₃^--N)为50:50时激发能分配不平衡性系数(β/α-1)下降至最低，激发能分配系数达到平衡。荧光量子产额和热耗散的量子产额(Ф_f，D) n(NH₄⁺-N):n(NO₃^--N)为50:50至25:75范围时用于光化学反应的量子产额(Ф_PS_Ⅱ)所占比例最高，依赖于类囊体膜两侧质子梯度和叶黄素循环的量子产额(Ф_NPQ)所占比例最低。该结果为探讨饲料桑‘青龙’幼苗光合作用电子流流向和激发能分配对不同氮素形态配比的响应规律，为饲料桑栽培中进行合理的苗期氮肥实施提供基础数据。

关键词: 兔眼蓝浆果, 兔眼蓝浆果, 嫩枝扦插, 内源激素, 不定根, IBA

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.

许楠,钟海秀,沙威,伍一宁,张会慧,孙广玉. 不同氮素形态配比对饲料桑幼苗叶片叶绿素荧光特性和能量分配的影响[J]. 中国农学通报, 2015, 31(26): 18-25.

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不同氮素形态配比对饲料桑幼苗叶片叶绿素荧光特性和能量分配的影响

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

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