Rootstock effects on xylem conduit dimensions and vulnerability to cavitation of Olea europaea L.
Rootstock effects on xylem conduit dimensions and vulnerability to cavitation of Olea europaea L.
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DOI：
10.1007/s00468-007-0148-9
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发表时间：
2007-06
期刊：
影响因子：
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通讯作者：
P. Trifilò;M. A. Lo Gullo;A. Nardini;F. Pernice;S. Salleo
中科院分区：
文献类型：
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作者：
P. Trifilò;M. A. Lo Gullo;A. Nardini;F. Pernice;S. Salleo
两个油橄榄无性系。研究了它们作为砧木时对水力结构和木质部空化的脆弱性的潜在影响。所用的克隆是“Leccino Minerva”（LM），显示出旺盛的生长，而“Leccino Dwarf”（LD）具有强烈的降低的生长。比较了自根LM和LD植物以及它们的嫁接组合，即LM/LD（Leccino Minerva嫁接到Leccino Dwarf砧木上）和LD/LM（Leccino Dwarf嫁接到Leccino Minerva砧木上）。与LD根（LD和LM/LD）的植物表现出显着减少的叶表面积与LM根的植物相比。木质部导管的LD拍摄比LM拍摄多25%。然而，当嫁接到LM砧木，LD芽产生一致的更宽，更长的船只比LD自根植物。这导致LD/LM植物增加茎对空化的脆弱性，空化阈值压力（Pc）小于0.5 MPa，而LD自根植物的Pc超过2.0 MPa。相比之下，虽然LD砧木造成了一些减少LM接穗的血管直径和长度，他们对LM水力结构的影响太小，以减少LM接穗相对于LM自根植物测量的空化的脆弱性。我们的结论是，虽然矮化砧木有效地减少嫁接植株的大小，他们不一定赋予更高的抗性木质部空化接穗，这将提高植物的抗旱性。
Two clones ofOlea europaeaL. were studied for their potential impact on hydraulic architecture and vulnerability to xylem cavitation, when used as rootstocks. The clones used were “Leccino Minerva” (LM), showing vigorous growth and “Leccino Dwarf” (LD) with strongly reduced growth. Self-rooted LM and LD plants as well as their grafting combinations were compared, namely, LM/LD (Leccino Minerva grafted onto Leccino Dwarf rootstock) and LD/LM (Leccino Dwarf grafted onto Leccino Minerva rootstocks). Plants with LD roots (LD and LM/LD) showed significantly reduced leaf surface area compared with plants with LM roots. Xylem conduits of LD shoots were 25% more numerous than in LM shoots. When grafted onto LM rootstocks, however, LD shoots produced consistently wider and longer vessels than measured in LD self-rooted plants. This caused LD/LM plants to increase stem vulnerability to cavitation with threshold pressures for cavitation (Pc) of less than 0.5 MPa compared with LD self-rooted plants that hadPcof over 2.0 MPa. By contrast, although LD rootstocks caused some reduction of vessel diameter and length of LM scions, their influence on LM hydraulic architecture was too small to reduce vulnerability to cavitation of LM scions with respect to that measured for LM self-rooted plants. Our conclusion is that although dwarfing rootstocks effectively reduce grafted plant size, they do not necessarily confer higher resistance to xylem cavitation to scions which would improve plant resistance to drought.