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首页> 外文会议>Geoscience and Remote Sensing Symposium, 2003. IGARSS '03. Proceedings. 2003 IEEE International >Changes in laser induced chlorophyll fluorescence signatures during regeneration of kacholam and colocasia plants from water stress
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Changes in laser induced chlorophyll fluorescence signatures during regeneration of kacholam and colocasia plants from water stress

机译：水分胁迫下Kacholam和芋的再生过程中激光诱导的叶绿素荧光特征的变化

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In vivo laser induced chlorophyll fluorescence (LICF) spectra were measured on a Jobin Yvon double monochromator with He-Ne laser (632.8 nm) excitation during the initiation and recovery phases of water stress in kacholam (Kaempferia galanga) and colocasia (Colocasia antiquorum) plants. The fluorescence intensity ratio (F685/F730) of the chlorophyll bands at 685 and 730 nm were determined during induction and recovery phases of water stress. The fluorescence induction kinetics (Kautsky effect) was also measured on dark adapted intact plant leaves at the chlorophyll bands for determining the vitality indices (Rfd values) and the stress adaptation index (Ap). It is seen that F685/F730 ratio for kacholam increased from 1.7 to 2.1 during 17 days of water stress; but regained to its initial value, within a few days of removal of stress. In the case of colocasia, the ratio increased from 2.0 to 3.7 in 12 days of treatment but recovered only to 3.5 on removal of stress. The colocasia plants could no longer sustain the photosynthetic functioning and its leaves dried up, subsequently. The Rfd-685, Rfd-730 and Ap values showed a decreasing trend with increasing water stress for kacholam and colocasia plants. Kacholam plants with Ap values of ca. 0.26 recovered fully to their normal conditions on re-watering. For colocasia, during the same water stress period, the mean Ap value decreased from 0.2 to 0.089; but could attain only values of 0.093 with 4 days of re-watering and further recovery was impossible as plants became dry with total impairment of the photosynthetic apparatus. Colocasia plants with lower Ap values suffered from stress earlier than kacholam plants that have higher Ap values. When the Ap values fall considerably below 0.1 during water stress, recovery becomes remote as the cytoplasm and chloroplast storma get dehydrated. The results demonstrate the usefulness of Ap and Rfd values in determining the potential photosynthetic activity of plants and its application in understanding the regeneration of photosynthetic functioning on removal of water deficit.
机译：在Kacholam（Kaempferia galanga）和香芋（Colocasia antiquorum）植物水分胁迫的起始和恢复阶段，在Jobin Yvon双单色仪上用He-Ne激光（632.8 nm）激发，测量了体内激光诱导的叶绿素荧光（LICF）光谱。 。在水分胁迫的诱导和恢复阶段，测定了685和730 nm处的叶绿素带的荧光强度比（F685 / F730）。还测定了在黑暗适应的完整植物叶片的叶绿素带上的荧光诱导动力学（考茨基效应），以确定活力指数（Rfd值）和胁迫适应指数（Ap）。可以看出，在缺水的17天中，kacholam的F685 / F730比从1.7增加到2.1。但在消除压力后的几天内恢复到了初始值。就芋头而言，该比例在治疗12天中从2.0增加到3.7，但在消除压力后仅恢复到3.5。香芋植物不能再维持光合功能，其叶子随后干dried。 Rfd-685，Rfd-730和Ap值显示出随着喀什拉姆和香芋植物水分胁迫的增加而降低的趋势。 Ap值约为1的Kacholam植物。重新浇水后，0.26完全恢复到正常状态。对于芋而言，在相同的水分胁迫时期，平均Ap值从0.2降低至0.089;在相同的水分胁迫期间，平均Ap值从0.2降低至0.089。但再浇水4天后只能达到0.093的值，并且由于植物变干而完全损害了光合作用装置，因此不可能进一步恢复。 Ap值较低的香芋植物比Ap值较高的香蒲草植物更容易遭受胁迫。在水分胁迫期间，当Ap值显着低于0.1时，随着细胞质和叶绿体的脱水而恢复，恢复变得遥遥无期。结果表明，Ap和Rfd值在确定植物潜在的光合作用活性中的用途，以及在理解去除缺水时光合作用的再生中的应用。

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