In order to research environment parameters and physiological indices of high-quality and high-yield apple trees, two orchards with young and mature apples trees were investigated to explore structural parameter of ap...In order to research environment parameters and physiological indices of high-quality and high-yield apple trees, two orchards with young and mature apples trees were investigated to explore structural parameter of apple tree and community, and some physiological indices in fields and by room measurements. The results showed that tree height of high-quality orchard was in the range of 260 to 290 cm, branch angle in 70°-75°, and orchard coverage rate in 75%-94%, and the connec-tion rates between rows and trees were lower. Furthermore, the total branches of mature orchard reached 1.04 ×106 per hm2, while the young orchard was 8.79 ×105 per hm2; the leaves were thick and chlorophyl content was high, with SPAD value at 58.22. Additional y, the photosynthesis of the orchard was strong, and net photo-synthetic rate was 17.48-21.8 μmolCO2/（m2·s）. The proportions of lateral shoot of bearing part were 81% and 75% respectively.展开更多
Ultracytochemical localization of Ca^(2+)was in-vestigated using the potassium pyroantimonate precipitation method during the development of phloem ganglion.The result showed that Ca^(2+)was mainly localized in the ce...Ultracytochemical localization of Ca^(2+)was in-vestigated using the potassium pyroantimonate precipitation method during the development of phloem ganglion.The result showed that Ca^(2+)was mainly localized in the cell wall and intercellular spaces in the initiating phase.With the de-velopment of the phloem ganglion,the distribution of Ca^(2+)transferred to the vacuole,and the Ca^(2+)deposits in the cell wall and intercellular space decreased.At the later stage of the developmental phase,Ca^(2+)was distributed in the tono-plast and vacuole phagocytosis,and the vacuole became the main calcium storage in this phase.At the early stage of maturation of the phloem ganglion,most of the phloem ganglion cells’vacuoles cracked,and the cytoplastic Ca^(2+)content increased in large number.In the mature phloem ganglion,not only were there a few Ca^(2+)localized in the cytoplast of mature cells,but also in the differentiating cells in the vacuoles.Ca^(2+)was distributed in the tonoplast and vacuole contents;initiating cells almost had no Ca^(2+).In general,Ca^(2+)concentration in mature phloem ganglion cells was at a low level.The results indicated that the changes in Ca^(2+)distribution evoked the phloem ganglion generation,and Ca^(2+)regulated the physiological function of the phloem ganglion.展开更多
基金Supported by Special Fund for Modern Agricultural Industry Technology System(CARS-28)~~
文摘In order to research environment parameters and physiological indices of high-quality and high-yield apple trees, two orchards with young and mature apples trees were investigated to explore structural parameter of apple tree and community, and some physiological indices in fields and by room measurements. The results showed that tree height of high-quality orchard was in the range of 260 to 290 cm, branch angle in 70°-75°, and orchard coverage rate in 75%-94%, and the connec-tion rates between rows and trees were lower. Furthermore, the total branches of mature orchard reached 1.04 ×106 per hm2, while the young orchard was 8.79 ×105 per hm2; the leaves were thick and chlorophyl content was high, with SPAD value at 58.22. Additional y, the photosynthesis of the orchard was strong, and net photo-synthetic rate was 17.48-21.8 μmolCO2/（m2·s）. The proportions of lateral shoot of bearing part were 81% and 75% respectively.
基金supported by the National Natu-ral Science Foundation of China (No.30271064).
文摘Ultracytochemical localization of Ca^(2+)was in-vestigated using the potassium pyroantimonate precipitation method during the development of phloem ganglion.The result showed that Ca^(2+)was mainly localized in the cell wall and intercellular spaces in the initiating phase.With the de-velopment of the phloem ganglion,the distribution of Ca^(2+)transferred to the vacuole,and the Ca^(2+)deposits in the cell wall and intercellular space decreased.At the later stage of the developmental phase,Ca^(2+)was distributed in the tono-plast and vacuole phagocytosis,and the vacuole became the main calcium storage in this phase.At the early stage of maturation of the phloem ganglion,most of the phloem ganglion cells’vacuoles cracked,and the cytoplastic Ca^(2+)content increased in large number.In the mature phloem ganglion,not only were there a few Ca^(2+)localized in the cytoplast of mature cells,but also in the differentiating cells in the vacuoles.Ca^(2+)was distributed in the tonoplast and vacuole contents;initiating cells almost had no Ca^(2+).In general,Ca^(2+)concentration in mature phloem ganglion cells was at a low level.The results indicated that the changes in Ca^(2+)distribution evoked the phloem ganglion generation,and Ca^(2+)regulated the physiological function of the phloem ganglion.
