Root suckering patterns in Populus euphratica (Euphrates poplar, Salicaceae)
Root suckering patterns in Populus euphratica (Euphrates poplar, Salicaceae)
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DOI：
10.1007/s00468-009-0341-0
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发表时间：
2009-05
期刊：
影响因子：
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通讯作者：
Martin Wiehle;P. Eusemann;N. Thevs;M. Schnittler
中科院分区：
文献类型：
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作者：
Martin Wiehle;P. Eusemann;N. Thevs;M. Schnittler
为了解在地下水滋养下以廊道林形式生长的土盖林(新疆，中国)的空间结构，采用形态和分子分析相结合的方法，对胡杨的根系进行了研究。幼苗长出很深的自来根，并将其作为成年树保持，而根吸入器永远不会形成自来根，而是利用它们的亲本树水平伸展的根。由此产生的反向“T”型根构型结构可靠地区分了成年的根吸器和繁殖生长的树木。由于来自根吸管的同化输入，远端根(指向母树的远端)很快变得比近端根厚，这使得可以确定营养生长的方向。对279株种子萌发的幼树和267株根茎进行了完整的定位，并用微卫星DNA进行基因分型，将选出的幼树归属于亲本树。在水平的“间隔器”根上，根吸器在距母树40米的地方发育，通常起源于地表以下不超过20厘米的深度。树木在10到15年的时间里开始根部吸奶，不久就达到了开花年龄。插穗试验表明，与母树断开连接的幼年根茎成活率降低。如果没有自来水根，并且根点靠近地表，地下水位下降会使根茎的适合性降低，甚至比以繁殖方式生长的树木更糟糕。
To understand the spatial structure of monospecific Tugai forests (Xinjiang Province, China) growing as gallery woods nourished by ground water, root suckering inPopulus euphraticawas studied by a combination of morphological and molecular analyses. Seedlings grow a deep tap root and keep this as adult trees, whereas root suckers never develop a tap root but utilize the horizontally stretching root of their parent trees. The resulting reverse “T” root architecture distinguishes reliably even adult root suckers from generatively grown trees. Due to assimilate input from the root sucker, the distal root (pointing away from the parent tree) becomes thicker soon than its proximal root, which allows determination of the direction of vegetative growth. One stand including 279 young trees germinated from seeds and 267 root suckers was mapped completely, and selected suckers were assigned to parent trees by genotyping with microsatellite DNA. Root suckers develop up to 40 m away from parent trees on horizontal “spacer” roots, usually originating not deeper than 20 cm below surface. Trees begin with root suckering between 10 and 15 years, shortly before reaching flowering age. Cutting experiments indicated reduced survival of young root suckers disconnected from the parent tree. Without a tap root and with a rooting point close to the surface, declining ground water levels should lower the fitness of root suckers even more than that of generatively grown trees.