Comparison of leaf life span, photosynthesis and defensive traits across seven species of deciduous broad-leaf tree seedlings
Comparison of leaf life span, photosynthesis and defensive traits across seven species of deciduous broad-leaf tree seedlings
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DOI：
10.1093/aob/mcl041
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发表时间：
2006-05-01
期刊：
影响因子：
4.2
通讯作者：
Koike, T
中科院分区：
文献类型：
--
作者：
Matsuki, S;Koike, T
为了验证“成本效益假说”，比较了日本北方7种落叶阔叶树幼苗的叶片寿命、光合参数和防御性状，对3种演替早期树种Alnus hirsuta、Betula maximowicziana和Betula platyphylla 'japonica“进行了研究;中演替种1种，即日本铁木;晚演替种3种，即鹅耳枥、蒙古栎和色木槭。测量了每个物种的光合参数和叶片防御性状（总酚、缩合单宁和韧性），并对蓖麻蚕幼虫进行了生物测定测试，以评估物种之间对草食动物攻击敏感性的差异。关键结果早期继承物种的叶寿命（62-88 d）比晚期继承物种（155-187 d）短。叶片氮含量、单位叶面积光饱和光合速率和单位叶质量光饱和光合速率与叶片寿命呈显著负相关。演替早期物种的氮含量约为30 mg g（-1），演替晚期物种的氮含量约为16 mg g（-1）。叶片韧性和C/N比与叶片寿命呈正相关，虽然缩合单宁与叶片寿命不相关。生物测定表明，幼虫存活天数与叶片寿命呈负相关。幼虫取食叶后的平均存活率。叶龄最短的是多毛类，为14.4d;蒙古栎叶龄最长，为6.6d。幼虫存活天数与叶片含氮量呈正相关。幼虫存活天数与防御性状之间不存在相关性。结论这些结果表明，叶寿命较短的物种比叶寿命较长的物种具有更高的光合生产力，并且更容易受到草食动物的攻击。这支持了“成本效益假设”。
Background and Aims Leaf life span, photosynthetic parameters and defensive traits were compared across seven species of deciduous broad-leaved tree seedlings native to northern Japan to test the 'cost-benefit hypothesis' that more productive leaves are more susceptible to herbivore attack than less productive leaves.Methods Studies were made on three early successional species, Alnus hirsuta, Betula maximowicziana and Betula platyphylla 'japonica'; one mid-successional species, Ostrya japonica, and three late-successional species, Carpinus cordata, Quercus mongolica 'grosseserrata' and Acer mono. Photosynthetic parameters and defensive traits (total phenolics, condensed tannin and toughness) of leaves were measured for each species, and a bioassay test with Eri silkmoth larvae (Samia cynthia ricini) was undertaken to evaluate differences between species in susceptibility to herbivore attack.Key Results Early successional species have a shorter leaf life span (62-88 d) than late successional species (155-187 d). Leaf nitrogen content and light-saturated photosynthetic rate per unit leaf area (P-sat-area) and per unit leaf mass (P-sat-mass) were negatively correlated with leaf life span. The nitrogen content of early successional species was about 30 mg g(-1) and that of late successional species was about 16 mg g(-1). Leaf toughness and the C/N ratio were positively correlated with leaf life span, although condensed tannin was not correlated with leaf life span. The bioassay test showed that the number of days the larvae survived was negatively correlated with leaf life span. Average survival of larvae feeding on leaves of A. hirsuta, which has the shortest leaf life span, was 14.4 d and that of Q. mongolica, which has the longest leaf life span, was 6.6 d. The number of days of larval survival was positively correlated with leaf nitrogen content. There was no correlation between days of larval survival and defensive traits.Conclusions These results indicate that species with a shorter leaf life span have higher photosynthetic productivity and are more susceptible to herbivore attack than species with a longer leaf life span. This supports the 'cost-benefit hypothesis'.