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打破对“光合作用过程”内容的传统教学模式,将灌输式教学改为探究式教学,通过对光合作用过程中科学史的挖掘,还原科学发现的本来面貌,让学生跟随着科学家的脚步,一步步探求光合作用的历程,认识光合作用的本质。 相似文献
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何道文 《内江师范学院学报》2007,22(4):74-77
对经过航天诱变的凤仙花SP2代的10个实验组与没有经过航天诱变的6个对照组植株的光合特性进行了比较.测得了光合速率等12个指标,进行相关分析发现:实验组中光照强度和光合速率呈极显著正相关,胞间CO2浓度和光合速率呈极显著负相关.对照组中,光照强度和光合速率正相关,胞间CO2浓度和光合速率为负相关.还对实验组以及对照组植株的光合色素含量等生理指标进行了测定,结果实验组光合色素含量大增,特别是叶绿素a含量增加更显著,叶绿素a与叶绿素b的比值也增大,而其可溶性糖含量极大地减少.本实验结果表明:航天诱变能对凤仙花的光合特性和生理生化方面产生显著且可遗传影响,能显著提高其光合能力. 相似文献
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INTRODUCTION Leaf senescence is a kind of programmed cell death (PCD) in plants that is highly controlled by a genetically programmed process involving degrada-tion of cellular structures, decline of photosynthesis massive generation of active oxygen species (AOS) and mobilization of nutrients (Nam, 1997; Lim et al.,2003). Many environmental factors have been shown to play a role in causing the photosynthetic decline to lead to premature senescence. Leaves exposed to ultraviolet radia… 相似文献
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Li FZ Jin SH Hu GC Fu YP Si HM Jiang DA Sun ZX 《Journal of Zhejiang University. Science. B》2005,6(8):803-811
A rice pse(t) (premature senescence, tentatively) mutant line, was isolated from 4500 independent T-DNA inserted transgenic lines. The symptoms of premature senescence appeared more severely than those of the control plants (Zhonghua 11,japonica) at the last development stage. To characterize the mutant and provide basic information on the candidate genes by mapping to a physical region of 220-kb, experiments were carried out in two phytotrons under controlled temperature of 24 ℃ and28 ℃, respectively. The content of chlorophyll, soluble protein and MDA (malondialdehyde), net photosynthesis, the antioxidant enzyme activities of SOD (superoxide dismuase) (EC 1.15.1.1) and POD (peroxidase) (EC 1.11.1.7) and the peptidase activities of leaves were measured from top to bottom according to the leaf positions at the flowering stage. Compared with the control plant,the mutant showed the following characteristics: (1) Higher net photosynthesis rate (Pn) appeared in the 1 st and 2nd leaves, contents of chlorophyll and soluble protein were also higher in the 1 st leaf; (2) The activities of SOD, POD and peptidase were higher according to the leaf position from top to bottom; (3) The symptom of premature senescence was accelerated in the mutant at 28℃treatment. The MDA content and the SOD and POD activities between the 24 ℃ and 28 ℃ treatment mutants were not significantly different. Content of chlorophyll and soluble protein of leaves mutant decreased rapidly at 28 ℃ treatment. The results show that pse(t) is sensitive to high temperature. The probable function of PSE(T) is discussed. 相似文献
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A comparative study on the photosynthetic parameters among intergeneric progenies derived from Oryza sativa L.×Sorghum vulgare L., its maternal parent Gui 630 and commercial 3-line hybrid rice Shanyou 63 in pot experiment in greenhouse was conducted. The morphological and photosynthetic characters of canopy leaves and chlorophyll fluorescence kinetic parameters including Fv/Fm, Fv/F0, photochemical quenching coefficient and non-photochemical coefficient of canopy leaves of 3 varieties were measured. The results showed the progeny, Yuanyou 1, derived from an intergeneric cross of rice and sorghum possesses better canopy spatial architecture with thicker, heavier and bigger canopy leaf than its maternal parent Gui 630. Higher photosynthetic rate due to higher chlorophyll content, higher primary energy transformation efficiency, potential of PSII and non-photochemical quenching coefficient (qE) were also measured in Yuanyou 1. These explain partly why the intergeneric progeny has higher biomass production, and better tolerance to adverse conditions and higher field yields even under stress conditions. 相似文献
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对脱毒裂萼草莓的叶绿素含量、生长温度、光强及叶绿素荧光参数变化进行了研究,结果表明:脱毒裂萼草莓叶绿素含量为2.885 mg/g.fw,较病叶提高了21.58%;在光强为0~2000μmolm-2s-1范围内,净光合速率(Pn)随光强的增加而增加,直到光饱和点,最大值为10.5μmol CO2m-2s-1;在温度为0~17℃时,Pn随温度增加而升高,17~40℃时,Pn随温度增加而下降,测出其最适生长温度为17℃左右;叶绿素荧光参数Fv/Fm变化较小. 相似文献
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对15个水稻组合剑叶在齐穗期和成熟期的光合作用以及茎鞘物质的输出率和转换率进行了研究,结果表明,15个组合中冈46 A/绵恢725和绵5A/辐恢838的特殊配合力最好,冈46 A/科恢746和绵香5A/明恢63的特殊配合力相对较差。 相似文献
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A comparative study on the photosynthetic parameters among intergeneric progenies derived fromOryza sativa L.×Sorghum vulgare L., its maternal parent Gui 630 and commercial 3-line hybrid rice Shanyou 63 in pot experiment in greenhouse was conducted.
The morphological and photosynthetic characters of canopy leaves and chlorophyll fluorescence kinetic parameters includingF
v/F
m,F
v/F
0, photochemical quenching coefficient and non-photochemical coefficient of canopy leaves of 3 varieties were measured. The
results showed the progeny, Yanyou 1, derived from an intergeneric cross of rice and sorghum possesses better canopy spatial
architecture with thicker, heavier and bigger canopy leaf than its maternal parent Gui 630. Higher photosynthetic rate due
to higher chlorophyll content, higher primary energy transformation efficiency, potential of PSII and non-photochemical quenching
coefficient (q
E) were also measured in Yuanyou 1. These explain partly why the intergeneric progeny has higher biomass production, and better
tolerance to adverse conditions and higher field yields even under stress conditions. 相似文献
30.
土壤水分对苗期烤烟生长发育及光合生理特性的影响 总被引：2，自引：0，他引：2
烤烟NC82及K326苗期（出苗、十字、生根、成苗）以上被相对持水量分别保持9｛小S、70～80％、60％、60％有利于种子前发．幼苗成活和壮苗的培育．上被水分过多或过少均影响种子前发及幼苗成活和烟苗地上、地下部的协调生长．成苗期烟苗的净光合速率（Pn）以上被相对持水量为60％时最高，水分过多、过少均使Pn下降，光合产物的积累减少． 相似文献