Herrmann Laetitia, Lesueur Didier, Bräu Lambert, Davison John, Jairus Teele, Robain Henri, Robin Agnès, Vasar Martti, Wiriyakitnateekul Wanpen, Öpik Maarja
School of Life and Environmental Sciences, Faculty of Science, Engineering and Built Environment - Deakin University (Burwood Campus), Melbourne, Australia.
CIRAD, UMR Eco&Sols, Land Development Department - Office of Science for Land Development, Paholyothin Road, Chatuchak, Bangkok, 10900, Thailand.
Mycorrhiza. 2016 Nov;26(8):863-877. doi: 10.1007/s00572-016-0720-5. Epub 2016 Jul 23.
Rubber tree (Hevea brasiliensis) is of major economic importance in Southeast Asia and for small land holders in Thailand in particular. Due to the high value of latex, plantations are expanding into unsuitable areas, such as the northeast province of Thailand where soil fertility is very low and therefore appropriate management practices are of primary importance. Arbuscular mycorrhizal fungi (AMF) contribute to plant growth through a range of mechanisms and could play a key role in a more sustainable management of the rubber plantations. We described the diversity of AMF associated with rubber tree roots in Northeast Thailand in relation to tree age and soil parameters along a chronosequence of rubber tree plantations. Cassava fields were included for comparison. Rubber tree and cassava roots harbored high diversity of AMF (111 Virtual Taxa, VT), including 20 novel VT. AMF VT richness per sample was consistently high (per site mean 16 to 21 VT per sample) along the chronosequence and was not related to soil properties. The composition of AMF communities differed between cassava and rubber tree plantations and was influenced by soil texture and nutrient content (sand, K, P, Ca). AMF community composition gradually shifted with the age of the trees. Our results suggest that the high diversity of AMF in this region is potentially significant for maintaining high functionality of AMF communities.
橡胶树（巴西橡胶树）在东南亚具有重要的经济意义，对泰国的小农户而言尤其如此。由于乳胶价值高，种植园正扩展到不合适的地区，比如泰国东北部省份，那里土壤肥力很低，因此适当的管理措施至关重要。丛枝菌根真菌（AMF）通过一系列机制促进植物生长，可能在橡胶种植园更可持续的管理中发挥关键作用。我们描述了泰国东北部与橡胶树根相关的AMF多样性，这与沿着橡胶树种植园时间序列的树龄和土壤参数有关。为作比较还纳入了木薯田。橡胶树和木薯根中AMF多样性高（111个虚拟分类单元，VT），包括20个新的VT。沿着时间序列，每个样本的AMF VT丰富度一直很高（每个地点每个样本平均16至21个VT），且与土壤性质无关。木薯种植园和橡胶树种植园的AMF群落组成不同，且受土壤质地和养分含量（沙子、钾、磷、钙）影响。AMF群落组成随树龄逐渐变化。我们的结果表明，该地区AMF的高度多样性对于维持AMF群落的高功能可能具有重要意义。
