optimization of surface sterilization treatments in two birch (betula sp.) species ‎

نویسندگان

جمیله نظری

دانشجوی دانشگاه منابع طبیعی گرگان در رشته جنگلشناسی و اکولوژی جنگل وحیده پیام نور

استادیار دانشکده علومجنگل. دانشگاه منابع طبیعی گرگان مهدی علیزاده

استادیار دانشکده تولید گیاهی. دانشگاه علوم کشاورزی و منابع طبیعی گرگان کمال قاسمی بزدی

استادیار موسسه پنبه کشور

چکیده

birch (betula sp.) is considered as extinction species and its natural regeneration in iranian forests ‎is very slow. difficulties in regeneration as well as natural seed germination of birch tree besides ‎high levels of seed contaminations have justified the application in‏ ‏vitro culture with respect to its ‎conservation and genetic improvement. hence, the in vitro culture initiation using seed explants of ‎two birch species was attempted. the seeds of b. pendula‏ ‏‎(collected from sangdeh altitudes, ‎mazandaran) and b. litwinowii‏ ‏‎(from siamarzkooh forests, golestan region) were randomly ‎harvested from the ten adult trees and then subjected to 7 surface sterilization treatments in 3 ‎replications. the experiment was undertaken as completely randomized design in factorial ‎arrangement (two factors) and 15 replications per each treatment. application of difnoconazole‏ ‏fungicide (3% for 24 h) followed by warm water (55°c in 30 min) and hgcl2 (0.1% for‎‏ ‏‎10 min) ‎were recognized as the best treatment for seed sterilization as well as germination. with this ‎treatment, 95-100%‎‏ ‏seeds were found to be free from bacterial and fungal contamination. ‎consequently, seeds of two species were cultured on ms and b5 media. the germination ‎percentage for b. litwinowii and‏ ‏b. pendula‎‏ ‏were recorded as 17.3% and 14%, respectively. in ‎conclusion, these in vitro raised plantlets may be used as a source explants for in vitro culture ‎initiation of birch species, whose seed collection is so difficult in such impassable sites. ‎

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عنوان ژورنال:
پژوهش های تولید گیاهی

جلد ۲۰، شماره ۳، صفحات ۱۵۹-۱۶۸

کلمات کلیدی
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