Productivity potentials of upland rice landraces (URLs) are continuously compromised by scanty water supply due to competing priorities for irrigations and fluctuations in agro-ecological conditions peculiar to low-in...Productivity potentials of upland rice landraces (URLs) are continuously compromised by scanty water supply due to competing priorities for irrigations and fluctuations in agro-ecological conditions peculiar to low-input farming systems. A growing demand for rice amidst decline in productive agricultural areas plunges into an urgent contribution of marginal areas critical in attaining food sufficiency among Filipino households. Agronomic performances of URLs locally found in Catanduanes province, Philippines were evaluated in a replicated trial utilizing three URLs: Kamanang [1], Kadari [2] and Bulaw [3]. The experimental set-up was closely monitored for consistent dry moisture content and zero fertilizer application. Results were significant for traditional upland landraces: Kamanang and Kadari, scored in terms of higher germination rate, increment plant height and the number of tillers during the vegetative stage. Leaf color gradations, although statistically not significant across cultivars, were suggestive of varying adaptive performance between traditional cultivars subjected to low-input system. Putative low-input responsive lines indicated by the higher survival percentage and overall agronomic responses were selected from the study site. Screened lines took part of the advance population which would be potentially able to tolerate poor soil conditions (i.e. poor storehouse of water and nutrients) especially in areas with edaphological constraints and changing rainfall distribution pattern. The development of putative drought tolerant lines among URLs forms the most economical solution implicated to areas with limited access to agricultural interventions.展开更多
KUP/HAK/KT钾转运体基因家族对植物吸收钾离子发挥重要作用,鉴定和克隆棉花的钾转运体基因,对于改良棉花的钾吸收特性,提高棉花的产量和品质具有重要意义。基于已测序的陆地棉基因组序列,本研究通过同源克隆的方法鉴定到陆地棉钾转运体...KUP/HAK/KT钾转运体基因家族对植物吸收钾离子发挥重要作用,鉴定和克隆棉花的钾转运体基因,对于改良棉花的钾吸收特性,提高棉花的产量和品质具有重要意义。基于已测序的陆地棉基因组序列,本研究通过同源克隆的方法鉴定到陆地棉钾转运体基因GhHAK5,并以陆地棉品种百棉1号为材料对其CDS序列进行扩增。结果表明,GhHAK5基因的CDS全长为2451 bp,编码816个氨基酸,分子量和等电点分别为91.23 k D和8.15。GhHAK5蛋白具有KUP/HAK/KT家族基因的保守结构域"K-trans"(Pfam02705)和标志性序列GXXXGDXXXSPLY,并具有11个跨膜区。在进化上,GhHAK5蛋白与拟南芥AtHAK5亲缘关系最近,其次是与水稻的OsHAK5,它们同属Cluster I进化簇。亚细胞定位结果显示,GhHAK5是一个定位于质膜的蛋白,这与其主要作为钾转运子参与K+吸收的功能是一致的。GhHAK5基因在根中表达量最高,在茎、叶、花瓣、纤维和花萼中表达量很低,且其表达受外界低钾环境诱导。本研究结果为进一步了解GhHAK5基因的功能及培育钾高效棉花品种奠定了基础。展开更多
文摘Productivity potentials of upland rice landraces (URLs) are continuously compromised by scanty water supply due to competing priorities for irrigations and fluctuations in agro-ecological conditions peculiar to low-input farming systems. A growing demand for rice amidst decline in productive agricultural areas plunges into an urgent contribution of marginal areas critical in attaining food sufficiency among Filipino households. Agronomic performances of URLs locally found in Catanduanes province, Philippines were evaluated in a replicated trial utilizing three URLs: Kamanang [1], Kadari [2] and Bulaw [3]. The experimental set-up was closely monitored for consistent dry moisture content and zero fertilizer application. Results were significant for traditional upland landraces: Kamanang and Kadari, scored in terms of higher germination rate, increment plant height and the number of tillers during the vegetative stage. Leaf color gradations, although statistically not significant across cultivars, were suggestive of varying adaptive performance between traditional cultivars subjected to low-input system. Putative low-input responsive lines indicated by the higher survival percentage and overall agronomic responses were selected from the study site. Screened lines took part of the advance population which would be potentially able to tolerate poor soil conditions (i.e. poor storehouse of water and nutrients) especially in areas with edaphological constraints and changing rainfall distribution pattern. The development of putative drought tolerant lines among URLs forms the most economical solution implicated to areas with limited access to agricultural interventions.
文摘KUP/HAK/KT钾转运体基因家族对植物吸收钾离子发挥重要作用,鉴定和克隆棉花的钾转运体基因,对于改良棉花的钾吸收特性,提高棉花的产量和品质具有重要意义。基于已测序的陆地棉基因组序列,本研究通过同源克隆的方法鉴定到陆地棉钾转运体基因GhHAK5,并以陆地棉品种百棉1号为材料对其CDS序列进行扩增。结果表明,GhHAK5基因的CDS全长为2451 bp,编码816个氨基酸,分子量和等电点分别为91.23 k D和8.15。GhHAK5蛋白具有KUP/HAK/KT家族基因的保守结构域"K-trans"(Pfam02705)和标志性序列GXXXGDXXXSPLY,并具有11个跨膜区。在进化上,GhHAK5蛋白与拟南芥AtHAK5亲缘关系最近,其次是与水稻的OsHAK5,它们同属Cluster I进化簇。亚细胞定位结果显示,GhHAK5是一个定位于质膜的蛋白,这与其主要作为钾转运子参与K+吸收的功能是一致的。GhHAK5基因在根中表达量最高,在茎、叶、花瓣、纤维和花萼中表达量很低,且其表达受外界低钾环境诱导。本研究结果为进一步了解GhHAK5基因的功能及培育钾高效棉花品种奠定了基础。
