جستجوی مقالات مرتبط با کلیدواژه "بساک" در نشریات گروه "باغبانی"

The aim of this study was to optimize different concentrations of some growth regulators and introduce the effective explants which lead to increase callus induction and regeneration efficiency in Catharanthus roseus L. and recognize growth stage which produce the highest amount of vincristine. The experiment was conducted as a factorial with a completely randomized design. The first factor was explant type at eight levels and the second factor was different concentrations of growth regulators at nine levels. The results showed that the highest percentage of callus induction was observed the medium containing 8 μM 2,4-D with 2 μM BAP in single node (100 percent), hypocotyl (100 percent), leaf (100 percent), root (99.16 percent), ovary (98.33 percent), petiole (95.83 percent), anther (94.16 percent) and cotyledon (93.33 percent) explants, respectively. Calluses derived from hypocotyl, anther and ovary explants were able to produce highly efficient somatic embryos. 0.8 g L-1 casein hydrolyzate cause the highest percentage of embryogenesis. The maximum germination percentage was obtained from explants drived from hypocotyl (53.66 %), anther (51.00 %) and ovary (46.00 %). Also, the regeneration percentage of hypocotyl, anther and ovary explants was 78, 73 and 68 percent, respectively. The topmost amount of vincristine in comparison with different types of calluses and different stages of growth was obtained from plants regenerated from callus which derived from anther, ovary and hypocotyl explants and the amount was 1.4 μg g-1 dry weight more than non-embryonic callus of the mentioned explants.

The purpose of the study was to improve plant regeneration efficiency in some commercial grapevine cultivars. To achieve this goal, embryogenic callus from immature anthers of six grapevine cultivars: ‘Bidaneh Sefid’, ‘Bidaneh Ghermez’, ‘Fakhri’, ‘Askari’, ‘Yaghuti’ and ‘Thompson Seedless’ were used. Embryogenic calli were cultured in plant growth regulator-free MS medium and the highest number of somatic embryos was observed in Bidaneh Sefid cultivar. Then, somatic embryos were transferred to two germination media: 1. MS medium containing 0.5 μM BAP and 2. MS medium containing 0.1 μM NAA plus 2.5 μM BAP. Plants with abnormal shoot and root apex were observed during germination; embryos with long root and abnormal shoot apex were also observed on medium containing 0.1 μM NAA plus 2.5 μM BA. There was no significant difference between the percentages of normal germination in ‘Askari’ on both media; however, higher normal germination was found on medium containing 0.5 μM BAP in other cultivars. After four weeks, plants were transferred to the MS and WPM media, both were supplemented with 0.5 μM BAP. Plants were transferred to regeneration media after four weeks. The regeneration percentage on WPM medium (76.87%) was higher than on MS medium (59.27%). Maximum percentage of regeneration was obtained from Askari (94.40%), Bidaneh Sefid (83.85%), Thomson Seedless (80.66%) and Bidaneh Ghermez (76%) on WPM.