Sorokan Antonina, Veselova Svetlana, Benkovskaya Galina, Maksimov Igor
Institute of Biochemistry and Genetics of the Ufa Federal Research Centre, Russian Academy of Sciences, 71 Oktyabrya avenue, Ufa 450054, Russia.
Plants (Basel). 2021 May 5;10(5):923. doi: 10.3390/plants10050923.
Plant damage caused by defoliating insects has a long-term negative effect on plant growth and productivity. Consequently, the restoration of plant growth after exposure to pathogens or pests is the main indicator of the effectiveness of the implemented defense reactions. A short-term Say attack on potato tube-grown plantlets ( L.) led to a reduction of both the length and mass of the shoots in 9 days. The decrease of the content of phytohormones-indole-3-acetic acid (IAA), abscisic acid (ABA), zeatin and zeatin-riboside-in shoots of damaged potato plants was found. Endophytic strain 26D (Cohn) is capable of secreting up to 83.6 ng/mL IAA and up to 150 ng/mL cytokinins into the culture medium. Inoculation of potato plants with cells of the 26D increases zeatin-riboside content in shoots and the mass of roots of undamaged plants, but does not influence content of IAA and ABA and growth of shoots. The presence of 26D in plant tissues promoted a rapid recovery of the growth rates of shoots, as well as the wet and dry mass of roots of plants after the pest attack, which we associate with the maintenance of a high level of IAA, ABA and cytokinins in their tissues.
食叶昆虫造成的植物损伤对植物生长和生产力具有长期负面影响。因此，接触病原体或害虫后植物生长的恢复是所实施防御反应有效性的主要指标。对马铃薯试管苗（L.）进行短期的Say攻击，导致9天内茎的长度和质量均下降。发现受损马铃薯植株茎中植物激素——吲哚-3-乙酸（IAA）、脱落酸（ABA）、玉米素和玉米素核苷的含量降低。内生菌株26D（科恩）能够向培养基中分泌高达83.6 ng/mL的IAA和高达150 ng/mL的细胞分裂素。用26D细胞接种马铃薯植株可增加未受损植株茎中玉米素核苷的含量以及根的质量，但不影响IAA和ABA的含量以及茎的生长。植物组织中26D的存在促进了害虫攻击后植株茎的生长速率以及根的湿重和干重的快速恢复，我们将此与它们组织中高水平的IAA、ABA和细胞分裂素的维持联系起来。
