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Physiological and growth responses of ‘Pantin’ and ‘Magana’ mamey sapote (Pouteria sapota) trees to continuous and cyclical flooding were studied in a series of experiments. Trees were grown in containers in a very gravelly loam soil and were subjected to continuous flooding of the root zone for 30–66 days (Experiments 1 and 2) or alternating flooding–unflooding cycles for 50 days (Experiments 3–5). For all experiments, the control treatment consisted of nonflooded trees. Net CO2 assimilation (A) and stomatal conductance (gs) decreased within 3 days of continuous flooding and internal CO2 concentration was significantly higher in leaves of flooded than nonflooded plants. In the cyclic flooding experiments, trees were flooded in 3- to 6-day cycles and then unflooded for the same time periods. Stomatal conductance and A decreased within 3 days of flooding, leaf epinasty occurred between days 5 and 10, leaf senescence and abscission occurred between days 15 and 30, and branch dieback and tree death occurred between days 30 and 60. Three cycles of 3-day flooding and 3-day recovery of trees had little effect on leaf gas exchange of ‘Magaña’ trees. Similarly, ‘Pantin’ trees survived 3 cycles of 6 days of flooding interspersed with 3–6 days of recovery despite consistent decreases in gs and A during flooding. Stomatal conductance and A of both mamey sapote cultivars decreased within a few days of flooding and this species appears to have intermediate flooding tolerance compared with other tropical fruit crops based on tree survival. 相似文献
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为了进一步开发和利用蛋黄果种子的潜在价值,对其主要营养成分、挥发油成分进行分析和检测,并研究了挥发油对5种细菌的抑制作用。结果表明：种子中淀粉、多糖、粗脂肪、多酚、灰分等成分含量较多,分别为13.89、8.04、6.27、2.58、2.22 g/100 g;Vc、黄酮、粗蛋白、氨基酸的含量分别为0.002、1.90、1.12、2.295 g/100 g。从种子挥发油中鉴定出22种化合物,主要成分为油酸、棕榈酸、邻苯二甲酸单（2-乙基己基）酯、芥酸酰胺,其相对百分含量分别为10.466%、8.158%、6.643%、4.216%。研究还证实蛋黄果种子挥发油对四联球菌、蜡状芽孢杆菌、白色葡萄球菌、大肠杆菌有抑制作用,其中对四联球菌和蜡状芽孢杆菌的抑制作用较强。鉴于蛋黄果种子的营养和药用价值丰富,建议大力开发和利用。 相似文献
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Effects of Pouteria cambodiana extracts on in vitro immunomodulatory activity of mouse immune system
Immunomodulatory activity of water and acetone extracts of stem bark of Pouteria cambodiana was examined on murine macrophage phagocytosis [nitroblue tetrazolium (NBT) dye reduction and lysosomal enzyme activity] and proliferation of splenocytes and bone marrow cells by 3-(4,5-dimethylthiazole-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay with and without lipopolysaccharide (LPS) or pokeweed mitogen (PWM). Both aqueous and acetone extracts presented immunomodulatory activity without clear dose response relationship. 相似文献
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