杧果蒂腐病菌潜伏侵染及其生物学特性研究
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摘要
在广西大学东校园园艺站的四号杧和紫花杧上调查开花期之前一个月的春梢枝条、盛花期的花梗、结果期的幼果和青熟果的带菌情况,以确定杧果蒂腐病菌的潜伏侵染习性。调查结果表明,开花期之前一个月就有蒂腐病菌潜伏在春梢的枝条上。从开花期之前一个月到成果贮存期共分离到42个能引起杧果腐烂的真菌菌株,除D-1、D-2、D-3、D-4、D-5、D-6、D-7、D-8、D-9外其余菌株经诱导都不产孢,经鉴定,D-1菌株为Dothiorella dominicana Pet.et Cif., D-2菌株为Botryodiplodia theobromae Pat.,D-3菌株为Pestalotiopsis sp.,D-4菌株为Colletotrichum gloeosporioides(Penz.)Sacc.,D-5菌株为Diplodina sp.,D-6菌株为Phomopsis mangiferae Ahmad,D-7菌株为Cladosporium sp.,D-8菌株为Penicillium sp.,D-9菌株为Aspergillussp.。D-1、D-2、D-3菌株于开花期之前一个月潜伏侵染枝条;D-4菌株于花期开始侵染花梗;D-5菌株于幼果期侵入,并潜伏于果蒂和果皮,至成果贮存期发病;D-6、D-7、D-8菌株于成果期开始潜伏侵染;D-9菌株仅于成果落果及贮存期腐烂果中发现。其中D-1、D-2、D-5菌株为采集地杧果蒂腐病的主要病原菌,D-3、D-6为次要病原菌。D-4、D-7、D-8、D-9菌株只在一定条件下引起杧果蒂腐病症状。在国内外均没有关于D-5菌株(Diplodina sp.)在杧果上为害的报道,因此D-5菌株(Diplodina sp.)是新发现的杧果蒂腐病菌。
     对D-5菌株(Diplodina sp.)进行的若干生物学特性测定表明:D-5菌株生长的温度范围为10~37℃,25~28℃为生长最适温区;菌丝在
    
     广两大学硕1毕业论文
    pH4刀~9.0范围内都可以生长,最适pH为5.5;光照以荧光最利于菌丝
    生长,而黑光诱导于座形成的能力最强;利用率最高的碳、氮源分别为
    乳糖和卜谷氨酸。参试的*种药剂中,有7种对D6菌株有抑制作用,
    它们的抑制作用由强到弱依次为敌力脱、施保克、特克多、多菌灵、世
    高、应得、特普哩。
     离体接种病原菌 Dotl;iorella do,l吻。。a,。a、BotrJ,o帅IOala tlteob。,。。ae
    和Diplodil。ti Sp的杜果果实中:过氧化物酶0OD)活性均比对照高,
    且果实发病越重POD活性越高,即致病力强的菌株诱导果内POD产生
    的能力比致病力弱的菌株强、发病时问越长果内POD活性越高。多酚氧
    化酶pPOD)活性变化与POD基本一致。苯丙氨酸解氨酶(PAL)活
    性在不同果实与病原菌的组合中变化规律稍有不同:Dothlbrella
    do。。。l。onna、Boil’yodtolodia ti’eob。,nae与四号杠的组合中,在距病斑 Icm
    处果皮内的PAL活性均比对照高,距病斑2、3Clll处果皮内的PAL活性
    则比对照低;而 Diplodtoa sp.与紫花杠的组合中,PAL活性比对照低。
The latent infection of the mango stem end rot pathogens was
    
    
    
    
    investigated by isolating the pothgens from the shoots prior to flowering, infloresence, ftuitlet, ripeless fruits and ripening fruit of two varieties, Shihaomang and Zihuamang , in mango orchard of Guangxi University. The result of investigation indicated that some stem end rot pathogengs were found to occur endophytically in the shoot prior to flowering. There were 42 isolates causing mango fruit rot that obtained from the period prior to flowering to store. Except nine isolates (D-l, D-2, D-3, D-4, D-5, D-6, D-7, D-8, D-9) produced conidia, all of the others didn't produce conidia after induction. After identifying, D-l, D-2, D-3, D-4, D-5, D-6, D-7, D-8, D-9 respectively were Dothiorella dominicana Pet.et Cif. , Botryodiplodia (heobromae Pat., Pestalotiopsis sp., Colletotrichum gloeosporioides (Penz.) Sacc., Diplodina sp., Phomopsis mangiferae Ahmad, Cladosporium sp., Penicillium sp. and Aspergillus sp. .D-1, D-2, D-3 latently infected the shoots perior to flowering ; D-4 stared to infecting the tissue of infloresence during flowering ; D-5 invaded fruitlets and made ripe fruits rotten after latent period; D-6, D-7, D-8 latently infected ripeless fruits before harvest; while D-9 only could be isolated from fallen and rotten fruits during storing. Among these pathogens, D-l, D-2, D-5 were the main pathogens that caused mango stem end rot in the orchard; while D-3, D-6 were the minor one; the others could cause the symptom of stem end rot only in certain conditions. There were no correspondent reports on mango stem end rot caused by Diplodina sp. in the world. So D-5 was identified to be a new pathogen of mango stem end rot.
    The study on biological characteristics of D-5 isolate (Diplodina sp.) indicated: The range of growth tempreture was 10-37 C, while the optimum growth tempreture was 25-28 C. It could growth between pH 4.0-9.0, while pH 5.5 wae it's optimum pH. Fluoresent light was the best light to it's growth, while black light was the best light to it's production of stroma. The best carbon and nitrogen source to it's growth was lactose and L-glutamic acid respectively. There were 7 fungicides showing control effects on it among the tested 11, and the control effects of the 7 fungicides from strong to weak successively were Tilt, Spoetak, Tecto, Carbendazim, Score, Indar, Diniconazole.
    The study on the activities of peroxidase (POD), polyphenoloxidase (PPOD) and phenylalanine ammonialyase (PAL) in mango peel after inoculation by Dothiorella dominicana, Botryodiplodia theobromae and
    
    
    
    Diplodina sp. indicated: The activities of POD after inoculation by pathogens were all higher than CK, furthermore, the activities of POD increased while the disease of mango became more serious, it meant that the pathogen with more strong pothogenicity could induce mango fruit producted more POD than that less pathogenicity or that the activities of POD higher and higher with the time of stem rot prolong. The change of the activities of PPOD was somewhate similar to POD. The activities of PAL had some differences between different combination of mango varietise and pathogen strains. The activities of PAL of combination of Dolhiorella dominicana, Botiyodiplodia theobromae and Sihaomang in mango peel were all higher than CK ,which aparted from disease spot 1 cm; while the activities of PAL in mango peel were all lower than CK, which aparted from disease spot 2 and 3 cm. The activities of PAL of combination of Diplodina sp. and Zihuamang in mango peel were all lower than CK too.
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