發(fā)布時(shí)間：2019-03-28 09:07

【摘要】：為探討干旱脅迫對(duì)牛樟(Cinnamomum kaneirae)光合和生理特性的影響,本研究以一年生牛樟扦插苗為材料,模擬干旱脅迫。分別于處理0天、5天、10天、15天及15天后復(fù)水5天共5個(gè)階段取樣,分析主要生理指標(biāo)的變化,研究其抗旱特性,結(jié)果如下。(1)絕對(duì)含水率隨著脅迫天數(shù)的增加而降低,第15天絕對(duì)含水率降為最低,顯著低于處理第0天,但復(fù)水5天后接近干旱前的水平。相對(duì)膜透性呈"單峰型"變化趨勢(shì),其峰值出現(xiàn)在第10天,復(fù)水后相對(duì)膜透性恢復(fù)到接近處理前的水平。(2)受脅迫后各階段的葉綠素含量均低于第0天的葉綠素含量,但葉綠素含量在干旱處理過(guò)程中差異不顯著。(3)干旱脅迫及復(fù)水對(duì)F0值無(wú)顯著影響。脅迫及復(fù)水期間Fm表現(xiàn)為先下降后上升,但復(fù)水后Fm值仍遠(yuǎn)低于受脅迫前的水平。Fv/m呈現(xiàn)上下波動(dòng)。(4)在脅迫第10天SOD、POD、CAT的活性達(dá)最大值,后持續(xù)下降,復(fù)水能使其接近處理前的水平,脅迫在復(fù)水后可能解除。綜上所述,各生理指標(biāo)的測(cè)定和分析表明一年生牛樟幼苗對(duì)干旱脅迫反應(yīng)較為敏感,其抗旱性較弱,可以適應(yīng)短期程度較弱的干旱脅迫,但復(fù)水有助于其恢復(fù)生長(zhǎng)。在牛樟幼苗培育期間應(yīng)及時(shí)灌溉,做好防旱抗旱措施。
[Abstract]:In order to study the effects of drought stress on photosynthetic and physiological characteristics of Cinnamomum camphora (Cinnamomum kaneirae), a year-old camphor cutting seedling was used to simulate drought stress. After 0 days, 5 days, 10 days, 15 days and 15 days of rehydration, the main physiological indexes were analyzed and their drought resistance characteristics were studied. The results were as follows: (1) the absolute water content decreased with the increase of stress days, and the absolute water content decreased to the lowest on the 15th day, which was significantly lower than the 0 day after treatment, but approached the pre-drought level after 5 days of rewatering. The relative membrane permeability showed a trend of "single peak", and its peak appeared on the 10th day. After rehydration, the relative membrane permeability returned to the level close to that before treatment. (2) the chlorophyll content in all stages after stress was lower than that on day 0. However, there was no significant difference in chlorophyll content during drought treatment. (3) drought stress and rehydration had no significant effect on F _ 0 value. During stress and rehydration, Fm decreased first and then increased, but Fm value after rehydration was still much lower than that before stress. FV / m fluctuated up and down. (4) the activity of SOD,POD,CAT reached the maximum value on the 10th day of stress, and then decreased continuously. Rehydration can make it close to the level before treatment, and the stress may be relieved after rehydration. In conclusion, the determination and analysis of each physiological index showed that one-year-old Cinnamomum camphora seedlings were more sensitive to drought stress, their drought resistance was weak, and they could adapt to short-term drought stress, but rehydration was helpful to restore their growth. In the seedling cultivation period of Cinnamomum camphora should be irrigated in time to do a good job drought prevention and drought relief measures.
【學(xué)位授予單位】：福建農(nóng)林大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：S792.23

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