Interactions between the parasitic angiosperm Orobanche aegyptiaca and its tomato host: Growth and biomass allocation
Interactions between the parasitic angiosperm Orobanche aegyptiaca and its tomato host: Growth and biomass allocation
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DOI：
10.1111/j.1469-8137.1996.tb01932.x
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发表时间：
1996-08-01
期刊：
影响因子：
9.4
通讯作者：
Quick, WP
中科院分区：
文献类型：
--
作者：
Barker, ER;Press, MC;Quick, WP
通过两个试验研究了寄生被子植物埃及列当对番茄植株生长和地上部/根系异速生长的影响。在第二个试验中，在一个感染水平（20 mg种子dm（-3））下，从14至91 d. a. p.进行多次收获。第一个实验表明，主机生物量近似线性减少10毫克种子dm（-3）土壤，超过此范围没有进一步减少。寄生虫还压低了芽/根比，改变之前的任何减少总生物量。这些趋势在第二个实验中得到了保持，随着时间的推移变得更加明显。与未感染的对照相比，从42 d. a. p.，在地面以上的寄生虫出现后，并对应于较低的相对生长速率（RGRs）在受感染的植物的发病。侵染还影响了RGR的组成部分：叶面积比（LAR）增加，单位叶率（ULR）降低。的数据进行了讨论相对于其他寄生杂草对主机的生长的影响。
The influence of the parasitic angiosperm Orobanche aegyptiaca on the growth and shoot/root allometry of tomato plants was studied in two experiments, In the first, the density of infection was manipulated, with host and parasite biomass being measured 56 d after planting (d.a.p.). In the second, multiple harvests were made from 14 to 91 d.a.p. at one level of infection (20 mg seed dm(-3)). The first experiment demonstrated an approximately linear reduction in host biomass up to 10 mg seed dm(-3) soil, beyond which there was no further reduction. The parasite also depressed shoot/root ratio, which changed prior to any decrease in total biomass. These trends were maintained in the second experiment, becoming more pronounced with time. Significant reductions were observed in host biomass compared with that of uninfected controls from 42 d.a.p., following the emergence of the parasite above ground, and corresponded with the onset of lower relative growth rates (RGRs) in the infected plants. Infection also influenced components of RGR:there was a stimulation of leaf area ratio (LAR) and a depression of unit leaf rate (ULR). The data are discussed with respect to the influence of other parasitic weeds on host growth.