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Abstract
One-year-old Mailing (M) 26 and Mailing Merton (MM) 111 apple rootstocks (Malus sp) were planted in pots in a greenhouse in March and harvested monthly from May to October. Samples of the shoot tip, stem bark, and new and old roots were collected for PVP-bonded and simple phenol analyses. The PVP-bonded phenols were highest in the shoot tip and lowest in the old roots. There was no consistent relationship with rootstock or time of collection. Five phenols were found in the shoot tip, 8 in the bark, and 8 in the new roots, including protocatechuic, ferulic, and benzoic acids. Benzoic acid was found only in the new roots. Phloridzin composed more than 90% of all the simple phenols found and was higher in MM 111 than in M 26 rootstock. The other phenols were not consistently higher in either rootstock and had few trends with time of collection. No direct relationship was found between phenol levels and dwarfing characteristics.
Abstract
Stem calli of various clones of apple (Malus domestica Borkh.) separated by filter paper, were grown on defined media to assess effects of one clone on growth of another in vitro. Certain clones affected the growth of the other when grown in the stock (callus in contact with media) or scion (on filter paper on stock callus) positions, or when placed on the media adjacent to each other (separated by filter paper). Both findings indicate the presence of mobile compounds from one clone capable of affecting growth of another clone.
Abstract
A higher level of auxin-like growth promoter was found in seedlings of the tall cucumber cultivar than in those of the dwarf. However, the highest level of GA-like growth promoter was found in the shoot tips of the dwarf cultivar, both in seedlings and mature plants; and this fraction was chromatographically similar to authentic GA3. The difference in GA-like activity between dwarf and tall was greater in the shoot tips of seedlings than in those of mature plants. Furthermore, the content of GA-like material was similar in dark grown tall and dwarf cucumber, but in light grown seedlings the activity was nearly twice as high in the dwarf as in the tall. These data are supported by mevalonate-2-14c feeding experiments.