Effects of arbuscular mycorrhizal inoculation on the growth, zinc distribution and photosynthesis of two citrus cultivars grown in low-zinc soil
Effects of arbuscular mycorrhizal inoculation on the growth, zinc distribution and photosynthesis of two citrus cultivars grown in low-zinc soil
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接种丛枝菌根对低锌土壤中两个柑橘品种生长、锌分配及光合作用的影响
DOI：
10.1007/s00468-014-1046-6
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发表时间：
2014-10-01
影响因子：
2.3
通讯作者：
Xiao, Jia-Xin
中科院分区：
文献类型：
--
作者：
Chen, Ying-Ying;Hu, Cheng-Yin;Xiao, Jia-Xin
嫁接在三叶橙菌根上的‘纽霍尔’和‘蓬坎’对低锌胁迫的反应不同，‘纽霍尔’的最佳生长更依赖于真菌接种。以低锌土壤为条件，研究了丛枝菌根真菌Glomus intraradices对嫁接在三叶橙（Poncirus trifoliata）砧木上的‘Newhall’脐橙（Citrus Sinensis）和‘Ponkan’柑桔（Citrus reticulata）植株生长、锌（Zn）浓度和分布及光合作用的影响。在缺锌条件下，两个品种的生长、叶片叶绿素水平、气体交换参数、根系可溶性糖水平和植株各部位锌水平均有相似的下降；然而，‘Ponkan’根系中锌含量有所增加，而‘nehall’保持稳定，说明‘nehall’可能具有更高的锌从根系到接穗梢的转运效率。接种AM对两个品种的生长、锌浓度和光合作用均有促进作用。与未感染的幼苗相比，am感染的幼苗的最小荧光值较低，而最大荧光值较高。此外，它们在光系统II （PS II）的最大光化学和潜在光化学方面效率更高。“Newhall”的变化更大，说明AM共生体可以缓解低zn对PS II反应中心的负面影响。此外，am侵染的‘Newhall’和‘Ponkan’幼苗叶片锌含量高于未侵染的幼苗，但根系锌含量低于未侵染的幼苗，尤其是前者。综上所述，在温室低锌土壤条件下嫁接“Newhall”的三叶橙幼苗中，G. intraradices有促进幼苗生长和锌分配的潜力。
'Newhall' and 'Ponkan' citrus cultivars grafted on trifoliate orange with mycorrhization by Glomus intraradices displayed different responses to low-Zn, and the optimal growth of 'Newhall' was more fungal inoculation dependent.The effects of arbuscular mycorrhizal (AM) fungus, Glomus intraradices, on plant growth, zinc (Zn) concentration and distribution, and photosynthesis were investigated in 'Newhall' navel orange (Citrus Sinensis) and 'Ponkan' tangerine (Citrus reticulata) grafted on the rootstock trifoliate orange (Poncirus trifoliata) exposed to low-Zn soil. Under the Zn-poor condition, the two cultivars showed similar decreases in growth, levels of leaf chlorophyll, gas exchange parameters, root soluble sugar, and Zn levels in various plant parts; however, the Zn percentage in the roots of 'Ponkan' was increased while in 'Newhall' it remained stable, indicating 'Newhall' may have a higher Zn translocation efficiency from the roots to the scion's shoots. AM inoculation improved growth, Zn concentrations and photosynthesis in the two cultivars. AM-infected seedlings had lower minimal fluorescence values but higher maximal fluorescence values than non-infected seedlings. In addition, they were more efficient in terms of photosystem II's (PS II's) maximal and potential photochemistry. The greater changes appeared in 'Newhall', implying AM symbioses could alleviate the negative effects of low-Zn on the PS II reaction center. In addition, AM-infected 'Newhall' and 'Ponkan' seedlings had higher Zn percentages in the leaves but lower Zn ratios in the roots than non-AM-infected seedlings, especially in the former cultivar. These results indicate that G. intraradices has the potential to enhance the growth and Zn distribution in 'Newhall' grafted on trifoliate orange seedlings grown in low-Zn soil in a greenhouse.