Control of plant growth resides in the shoot, and not in the root, in reciprocal grafts of flacca and wild-type tomato (Lysopersicon esculentum), in the presence and absence of salinity stress
Control of plant growth resides in the shoot, and not in the root, in reciprocal grafts of flacca and wild-type tomato (Lysopersicon esculentum), in the presence and absence of salinity stress
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DOI：
10.1023/a:1026279719242
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发表时间：
2003-09-01
期刊：
影响因子：
4.9
通讯作者：
Sagi, M
中科院分区：
文献类型：
--
作者：
Chen, GX;Fu, XP;Sagi, M
嫁接植物flacca，ABA缺乏突变体的番茄（番茄），和野生型品种莱茵兰Ruhm生长与盐胁迫和不测试的作用，根和芽在植物生长的调节。14天后，暴露于200 mM NaCl，地上部和根鲜重，内源阿坝浓度，硝酸盐浓度，选定的酶的活性相关的氮同化，阳离子积累进行了测定。砧木基因型对嫁接植物的生长几乎没有影响，而嫁接植物具有野生型芽（Ws）产生更多的生物量比那些有flacca芽（Fs），无论盐度水平。嫁接在野生型砧木上的蒜薹新梢生长量（Fs/Wr）比嫁接在蒜薹砧木上的蒜薹新梢生长量（Fs/Fr）高出上级。提高生长与增强水平的阿坝在flacca芽Fs/Wr。在所有的嫁接组合中，阿坝含量在野生型芽高于flacca芽，有或没有盐。不同嫁接类型间根系阿坝含量差异不显著。增强生长与较高的硝酸盐水平和较高的硝酸还原酶活性的植物的根和芽与野生型芽和较高的芽浓度的阿坝与野生型芽的植物。有没有显着差异谷氨酰胺合成酶和磷酸烯醇丙酮酸羧化酶活性在所有的嫁接植物的地上部和根系，无论盐水平。而地上部基因型决定了K+和Na+在嫁接植株中的积累，而不受盐胁迫的影响，它对Ca 2+浓度没有影响。无论盐度，阳离子的总浓度是相同的，在所有的植物，而盐降低Mg 2+浓度的根和芽的所有嫁接，与flacca嫁接枝除外。因此，接穗基因型-及其阿坝水平-在嫁接植物的生长中发挥了主要作用，无论砧木基因型和生长介质的盐度。
Grafted plants of flacca, an ABA-deficient mutant of tomato ( Lycopersicon esculentum), and the wild-type variety Rheinlands Ruhm were grown with and without salinity stress to test the roles of roots and shoots in the regulation of plant growth. Fourteen days after exposure to 200 mM NaCl, shoot and root fresh weight, endogenous ABA concentrations, nitrate concentration, activities of selected enzymes related to nitrogen assimilation, and cation accumulation were determined. Rootstock genotype had little influence on the growth of the grafted plants, whereas grafted plants having wild-type shoots (Ws) produced more biomass than those having flacca shoots (Fs), irrespective of the salinity level. Growth of flacca shoots grafted onto wild-type rootstock (Fs/Wr) was superior to that of flacca shoots grafted onto flacca rootstock (Fs/Fr). The improved growth correlated with enhanced levels of ABA in the flacca shoots of Fs/Wr. In all the graft combinations, ABA content was higher in wild-type shoots than in flacca shoots, with or without salinity. There were no significant differences in root ABA concentrations among the different grafted types. Enhanced growth correlated with higher nitrate levels and higher nitrate reductase activity in the roots and shoots of plants with wild-type shoots and with higher shoot concentrations of ABA in plants with wild-type shoots. There were no significant differences in glutamine synthetase and phosphoenol pyruvate carboxylase activities in the shoots and roots of all the grafted plants, regardless of the salinity level. While shoot genotype determined the accumulation of K+ and Na+ in grafted plants regardless of salinity, it had no influence on Ca2+ concentrations. Regardless of the salinity, the total concentration of cations was the same in all the plants, while salinity decreased Mg2+ concentration in roots and shoots of all grafts, with the exception of flacca grafted shoots. The scion genotype - and its ABA level - thus played the major role in the growth of grafted plants, regardless of the rootstock genotype and the salinity of the growth medium.