کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2015375 1067557 2010 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Mycorrhiza formation is not needed for early growth induction and growth-related changes in polyamines in Scots pine seedlings in vitro
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک دانش گیاه شناسی
پیش نمایش صفحه اول مقاله
Mycorrhiza formation is not needed for early growth induction and growth-related changes in polyamines in Scots pine seedlings in vitro
چکیده انگلیسی

Ectomycorrhizal (ECM) fungi have been shown to improve growth of the host plant before the formation of physical ECM structures, i.e. during the so-called pre-mycorrhizal phase. In the present study, changes in growth and the concentrations of individual polyamines (PAs) were followed during the mycorrhiza formation in Scots pine (Pinus sylvestris) seedlings in the presence of two ECM fungi, Pisolithus tinctorius and Paxillus involutus. The two fungus stains were chosen because they differed in infection characteristics as well as in PA and auxin production. The results were compared to our earlier study with two Suillus variegatus strains forming ECMs with Scots pine seedlings in vitro. Paxillus was not able to form ECMs whereas Pisolithus formed ECM association with Scots pine seedlings within two weeks. However, Paxillus enhanced the growth of the seedlings more than Pisolithus. Paxillus also increased putrescine (Put) concentrations of the seedlings in the pre-mycorrhizal phase much more than Pisolithus. A similar trend was observed in the free spermidine (Spd) in stems, whereas in the needles Paxillus decreased free Spd concentration. Pisolithus caused a threefold greater increase in root free Spd than Paxillus. Effects of Paxillus on the growth and PA fluctuation, excluding root free Spd, of the host plant resembled that observed in our previous in vitro study on S. variegatus–Scots pine interaction. Therefore, changes in specific PA concentrations in the pre-mycorrhizal phase seem to be related to growth induction by the ECM fungus rather than to mycorrhiza formation. Moreover, we suggest that growth induction in host plants is not necessarily followed by ECM formation.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Plant Physiology and Biochemistry - Volume 48, Issue 7, July 2010, Pages 596–601
نویسندگان
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