Higher Elevations Tend to Have Higher Proportion of Plant Species With Glandular Trichomes.
Higher Elevations Tend to Have Higher Proportion of Plant Species With Glandular Trichomes.
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海拔越高，具有腺毛的植物物种比例越高
DOI：
10.3389/fpls.2021.632464
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发表时间：
2021
影响因子：
5.6
通讯作者：
Song B
中科院分区：
文献类型：
--
作者：
Wu R;Lev-Yadun S;Sun L;Sun H;Song B
众所周知，腺毛参与植物对食草动物，特别是食草性昆虫的化学和物理防御。然而，对腺毛发生的大规模地理模式知之甚少。低海拔地区的食草压力被认为更高，因为那里的气候更温暖、更稳定。因此，我们预测在低海拔地区有腺毛的物种比例高于在高海拔地区。我们收集了横断山区(中国西南的全球生物多样性热点)6,262种被子植物的腺毛数据。我们测试了海拔梯度(800-5000 ma.s.l.)在有腺毛的植物物种的发生中，以及它与生物(草食性昆虫的发生)和非生物因素的相关性，潜在地塑造了腺毛发生的海拔梯度。我们发现海拔高度与腺毛的出现呈显著正相关，腺毛的物种比例从800ma.s.l时的11.89%增加到了11.89%。在海拔4700m以上，这种跨种间关系在考虑了物种间的系统发育关系后仍然显著。食草性昆虫的丰富度在中等海拔时达到峰值，与腺毛发生率的相关性很弱。年平均温度是与腺毛呈负相关的最重要因素。我们的结果并不支持植物防御能力随海拔升高而减弱的假说。相反，观察到更高比例的植物物种向着更高的海拔方向具有腺毛。我们的结果还强调了在测试多功能植物防御的地理变异时考虑生物和非生物因素同时影响的重要性。
Glandular trichomes are well known to participate in plant chemical and physical defenses against herbivores, especially herbivorous insects. However, little is known about large-scale geographical patterns in glandular trichome occurrence. Herbivory pressure is thought to be higher at low elevations because of warmer and more stable climates. We therefore predicted a higher proportion of species with glandular trichomes at low elevations than at higher elevations. We compiled glandular trichome data (presence/absence) for 6,262 angiosperm species from the Hengduan Mountains (a global biodiversity hotspot in southwest China). We tested the elevational gradient (800–5,000 m a.s.l.) in the occurrence of plant species with glandular trichomes, and its correlations with biotic (occurrence of herbivorous insects) and abiotic factors, potentially shaping the elevational gradient in the occurrence of glandular trichomes. We found a significantly positive relationship between elevation and the occurrence of glandular trichomes, with the proportion of species having glandular trichomes increasing from 11.89% at 800 m a.s.l. to 17.92% at above 4,700 m. This cross-species relationship remained significant after accounting for phylogenetic relationships between species. Herbivorous insect richness peaked at mid-elevations and its association with the incidence of glandular trichomes was weak. Mean annual temperature was the most important factor associated negatively with glandular trichomes. Our results do not support the hypothesis that plant defenses decrease with increasing elevation. In contrast, a higher proportion of plant species with glandular trichome toward higher elevations is observed. Our results also highlight the importance of considering the simultaneous influences of biotic and abiotic factors in testing geographical variation in multifunctional plant defenses.
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影响因子：
5.9
作者：
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通讯作者：
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通讯作者：
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