Early results from genetic trials on the growth of Spanish cedar and its susceptibility to the shoot borer moth in the Yucatan Peninsula, Mexico
Early results from genetic trials on the growth of Spanish cedar and its susceptibility to the shoot borer moth in the Yucatan Peninsula, Mexico
复制标题
墨西哥尤卡坦半岛西班牙雪松生长及其对蛀虫易感性的基因试验的早期结果
DOI：
10.1016/j.foreco.2007.09.057
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发表时间：
2008
影响因子：
3.7
通讯作者：
B. Santiago
中科院分区：
文献类型：
--
作者：
S. Ward;K. Wightman;B. Santiago
香柏(Cedrela Odorata)是一种新热带阔叶树种，对家具和室内配件的需求很高。1998年，墨西哥尤卡坦半岛的西班牙雪松收集了种子，用于遗传保护和树木改良项目。这些标本的后代是在尤卡坦半岛的巴卡拉尔、能贝克和若尔拉古纳进行的基因试验中确定的。巴卡拉的2年存活率为73.5%，能北克的2年存活率为72%，但在拉古纳动物园多次重复的6个月后存活率仅为20%。在巴卡拉和能北缘，平均2年高、顶枝侵染年数(超过2~3年)和总分枝数分别为1.3m、0.04年和2.5a和1.9m、0.35年和1.6个。选择三个最好的种源(Escárcega、Bacalar和Calakmul)将导致两年生树高估计8.6%的跨地收益。2年生树高、二化螟侵袭力和分枝的种源内遗传力分别为0.1±0.02、0.0±0.02和0.0±0.02。2年生高、二化螟危害和分枝的单点遗传力分别为0.09±0.05、0.02±0.04、0.09±0.05和0.16±0.07、0.0±0.06、0.0±0.07。鉴于快速生长的已知优势可以长期避免对Hypsiyla的损害，以及种源在生长性状上的跨地点稳定表现，我们建议在多次试验中进行种源选择，以减少昆虫严重损害的风险。优良的种源和其他合适的种子来源，以及适当的地点选择和营林措施，是提高玉竹种植园产量的重要工具。
Cedrela odorata (Spanish cedar) is a neotropical broadleaf tree species that is in high demand for furniture and interior fittings. In 1998, seed collections were made from Spanish cedar in the Yucatan Peninsula, Mexico, for genetic conservation and tree improvement projects. Progeny from these collections were established in genetic trials at Bacalar, Noh Bec, and Zoh Laguna in the Yucatan. Survival at 2 years was 73.5% at Bacalar, 72% at Noh Bec, but only 20% after 6 months for several replicates at Zoh Laguna. Mean 2-year height, number of years of Hypsipyla attack on apical shoots (over 2 or 3 years) and total branching over 2 years, were 1.3m, 0.04 years, and 2.5 branches at Bacalar, and 1.9m, 0.35 years, and 1.6 branches at Noh Bec. Selection of the three best provenances (Escárcega, Bacalar, and Calakmul) would result in an estimated cross-site gain of 8.6% in 2-year height. Within-provenance, cross-site heritabilities for 2-year height, shoot borer attack, and branching were 0.1±0.02, 0.0±0.02, and 0.0±0.02, respectively. Single-site heritabilities for height at 2 years, shoot borer attack, and branching were 0.09±0.05, 0.02±0.04, and 0.09±0.05 at Bacalar and 0.16±0.07, 0.0±0.06, and 0.0±0.07 at Noh Bec. Given the known advantage of rapid growth to avoid Hypsipyla damage over the long term and the stable performance of provenances across sites for growth traits, we recommend provenance selection over multiple trials to reduce the risk of serious damage by the insect. Good provenances and other suitable seed sources, as well as proper site selection and silvicultural practices, are important tools for increasing yields from plantations of C. odorata.