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The Water and Nutrition Relationships between Mistletoe and Its Host Mangrove Species

Author: HuangLi
Tutor: WangWenQing
School: Xiamen University
Course: Ecology
Keywords: Mistletoe Mangrove plants Salt stress
CLC: S718.4
Type: Master's thesis
Year: 2009
Downloads: 84
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Abstract


This paper studies the tumor If the mistletoe Viscum ovalifolium and mangrove plant Sonneratia Sonneratia caseolaris parasitic system. Viscum Viscum Loranthaceae evergreen shrub or sub-shrub, and a semi-parasitic plant. The test site for the Hainan Qinglangang mangrove nature reserve, the average seawater salinity plots 17.2ppt. Plant leaves, chlorophyll fluorescence and photosynthetic gas exchange rates measured under natural conditions, the light response curves and CO 2 response curve was measured in a controlled environment. Simultaneous determination of the chlorophyll content, leaf osmotic potential of xylem and leaf elements (Na, Cl, K, Ca, Mg, N, P) content. 1 with the results of previous studies, where the mistletoe leaf transpiration rate (Tr) throughout the day lower than the host, but both have very high leaf nitrogen content. Assumptions: (1) verify parasitic mistletoe in mangrove plants will reduce their Tr when the nitrogen supply is sufficient, in order to avoid excessive accumulation of salt. (2) Although mistletoe Tr is lower than the host, but still support the mistletoe the high transpiration nitrogen absorption hypothesis. Studied from the physiological and biochemical aspects of plant photosynthesis, photosynthetic efficiency of salt stress under the mistletoe host photoinhibition and light protection, the results show that: (1) the maximum photosynthetic efficiency of the leaves of healthy plants Fv / Fm values Usually between 0.83 to 0.85, the mangrove plant Sonneratia Fv / Fm value of 0.841. And the data shows the plants photosynthetic rate of Sonneratia (A) is not subject to significant restrictions, even under high light intensity Sonneratia less prone to photoinhibition still prove that the salt tolerance of mangrove plants. (2) the mistletoe photosynthetic biochemical markers such as maximum carboxylation rate (V cmax ) and maximum electron transport rate (J max ) were significantly lower than the host, support the mistletoe The lower bottom photosynthetic conclusions. However, its unit leaf area high chlorophyll content, by increasing the chlorophyll content per unit area to raise A. (3) throughout the day in the mistletoe stomatal conductance (gs) were lower than the host mesophyll conductance (gm) was also significantly reduced under salt stress the mistletoe A main reason for the reduced diffusion limit restrictions that gs and gm. (4) mistletoe Fv / Fm value of 0.795, significantly less than the normal value, mistletoe photoinhibition. But, the Fv / Fm values ??decreased mainly due to the reduction of the maximum fluorescence Fm rather than the background fluorescence Fo rise, mistletoe permanent light degree of damage occurred relatively light occurs mainly recoverability the light deactivation. (5) the mistletoe non-photochemical quenching (MPQ) with the light intensity increases linearly rising salt stress under the mistletoe light protection mechanism. Demmig-Adams Analysis: Despite the mistletoe for electron transfer light energy lower but higher energy for heat dissipation, so the blades and there is no accumulation of excess energy to prove the mistletoe improve heat dissipation light protection mechanism is effective. 3.K, Na, Ca and Mg ions by suction device from the host to enter the process of mistletoe, the K content is substantially unchanged, Na reduced, Ca reduced, and Mg increased proved mistletoe is selective absorption of ions . The haustoria accumulated very high ion content, the support directly connected mistletoe their host does not exist between the xylem and xylem. Nitrogen uptake mechanism combined with mistletoe transpiration, this paper presents the assumptions: the haustoria neither communicate directly xylem conduit is not completely parenchyma, but both that the absorption of nutrients that are passive absorption of active absorption. 4. Mistletoe here Tr is lower than the host, but having a very low A resulting in a lower water use efficiency (A / E). Speculated the Mistletoe by raising carbon absorption different from the host in order to protect the plant's carbon balance of payments.

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