To better understand waterlogging effect on leaf senescence in winter rapseed (Brassica napus L.) during flowering stage, experiments were designed to explore foliar K application influences on adverse effects of wate...To better understand waterlogging effect on leaf senescence in winter rapseed (Brassica napus L.) during flowering stage, experiments were designed to explore foliar K application influences on adverse effects of waterlogging stress. Winter rapeseed was sprayed with K after waterlogging at initial flowering stage. Results indicated that waterlogging significantly decreased leaf net photosynthetic rate (Pn), stomatal conductance (Gs), intercellular CO2 concentration (Ci) and transpiration rate (Tr). It also declined maximum quantum yield of PS II (Fv/Fm), quantum yield of electron transport (ΦPS II) and photochemical quenching (qP), but increased leaf non-photochemical quenching (NPQ) and minimal fluorescence (Fo). Interestingly, exogenous application of K significantly alleviated waterlogging-induced photosynthesis inhibition. Foliar K application increased RuBisCO activation, chlorophyll and soluble protein contents, while significantly decreased MDA content under waterlogging stress. Moreover, K supplementation improved accumulation of K+, Ca2+, Mg2+, N, Zn2+, Mn2+, Fe2+ in leaves. In general, foliar K application is effective inalleviating deleterious effects of waterlogging stress and delays leaf senescence of winter rapeseed.展开更多
应用双向电泳结合液相色谱-质谱联用(LC-MS)分析,筛选得到干旱胁迫下白菜型冬油菜与光合作用相关差异蛋白质RuBisCo小亚基。根据已发表白菜型油菜(Brassicarapa)RuBisCo亚基rbcL和rbcS保守序列设计引物,采用RT-PCR扩增陇油7号的cDNA,获...应用双向电泳结合液相色谱-质谱联用(LC-MS)分析,筛选得到干旱胁迫下白菜型冬油菜与光合作用相关差异蛋白质RuBisCo小亚基。根据已发表白菜型油菜(Brassicarapa)RuBisCo亚基rbcL和rbcS保守序列设计引物,采用RT-PCR扩增陇油7号的cDNA,获得rbcL和rbcS基因开放阅读框,长度分别为1095 bp和549 bp,编码364和181个氨基酸的蛋白质。生物信息学分析结果显示, rbcL与大白菜(Brassica rapa subsp. chinensis)的蛋白质同源性达到99%以上,其保守序列属于RuBisCoLarge超家族,该蛋白质理论相对分子量及等电点分别为40.29kDa和6.70,不稳定指数(instabilityindex,II>40为不稳定蛋白质)为41.67,属于不稳定蛋白;脂融指数(aliphaticindex)为83.63,平均亲水性值(grand average of hydropathicity)为-0.232,属于亲水性蛋白质;二级结构包括38.74%α-螺旋(alpha helix)、10.99%延伸链(extendedstrand)及50.27%自由卷曲(randomcoil);三级结构具有5个不同的活性口袋。rbcS与甘蓝(Brassicaoleracea)蛋白质同源性达到99%,其保守序列具有rbcS超家族和RuBisCo Small Like超家族,理论相对分子量为20.32 kDa,理论等电点为8.23,不稳定指数为33.66,属于稳定蛋白质;脂融指数为74.86,平均亲水性值为-0.142,属于亲水性蛋白质;二级结构包括16.02%α-螺旋、28.73%的延伸链及55.25%自由卷曲;三级结构具有4个不同的活性口袋。实时荧光定量和半定量分析显示,干旱胁迫下,白菜型冬油菜叶片rbcL和rbcS基因表达量下调是光合作用下降的原因。并且,冬油菜叶片Pn下降与RuBPCase表达抑制和活性降低有关,非气孔限制是Pn下降的主要因素。展开更多
文摘To better understand waterlogging effect on leaf senescence in winter rapseed (Brassica napus L.) during flowering stage, experiments were designed to explore foliar K application influences on adverse effects of waterlogging stress. Winter rapeseed was sprayed with K after waterlogging at initial flowering stage. Results indicated that waterlogging significantly decreased leaf net photosynthetic rate (Pn), stomatal conductance (Gs), intercellular CO2 concentration (Ci) and transpiration rate (Tr). It also declined maximum quantum yield of PS II (Fv/Fm), quantum yield of electron transport (ΦPS II) and photochemical quenching (qP), but increased leaf non-photochemical quenching (NPQ) and minimal fluorescence (Fo). Interestingly, exogenous application of K significantly alleviated waterlogging-induced photosynthesis inhibition. Foliar K application increased RuBisCO activation, chlorophyll and soluble protein contents, while significantly decreased MDA content under waterlogging stress. Moreover, K supplementation improved accumulation of K+, Ca2+, Mg2+, N, Zn2+, Mn2+, Fe2+ in leaves. In general, foliar K application is effective inalleviating deleterious effects of waterlogging stress and delays leaf senescence of winter rapeseed.
文摘应用双向电泳结合液相色谱-质谱联用(LC-MS)分析,筛选得到干旱胁迫下白菜型冬油菜与光合作用相关差异蛋白质RuBisCo小亚基。根据已发表白菜型油菜(Brassicarapa)RuBisCo亚基rbcL和rbcS保守序列设计引物,采用RT-PCR扩增陇油7号的cDNA,获得rbcL和rbcS基因开放阅读框,长度分别为1095 bp和549 bp,编码364和181个氨基酸的蛋白质。生物信息学分析结果显示, rbcL与大白菜(Brassica rapa subsp. chinensis)的蛋白质同源性达到99%以上,其保守序列属于RuBisCoLarge超家族,该蛋白质理论相对分子量及等电点分别为40.29kDa和6.70,不稳定指数(instabilityindex,II>40为不稳定蛋白质)为41.67,属于不稳定蛋白;脂融指数(aliphaticindex)为83.63,平均亲水性值(grand average of hydropathicity)为-0.232,属于亲水性蛋白质;二级结构包括38.74%α-螺旋(alpha helix)、10.99%延伸链(extendedstrand)及50.27%自由卷曲(randomcoil);三级结构具有5个不同的活性口袋。rbcS与甘蓝(Brassicaoleracea)蛋白质同源性达到99%,其保守序列具有rbcS超家族和RuBisCo Small Like超家族,理论相对分子量为20.32 kDa,理论等电点为8.23,不稳定指数为33.66,属于稳定蛋白质;脂融指数为74.86,平均亲水性值为-0.142,属于亲水性蛋白质;二级结构包括16.02%α-螺旋、28.73%的延伸链及55.25%自由卷曲;三级结构具有4个不同的活性口袋。实时荧光定量和半定量分析显示,干旱胁迫下,白菜型冬油菜叶片rbcL和rbcS基因表达量下调是光合作用下降的原因。并且,冬油菜叶片Pn下降与RuBPCase表达抑制和活性降低有关,非气孔限制是Pn下降的主要因素。