Search Results
You are looking at 1 - 4 of 4 items for
- Author or Editor: C. H. Hendershott x
Abstract
The “after-rest” and “post-rest” quiescent periods of flower buds of 2 peach cultivars of different chilling requirements were characterized by a period of reduced inhibition during which the degree of inhibition decreased each succeeding week. Buds within this reduced period of inhibition appeared to be quiescent since they broke and grew during 2 weeks in a greenhouse. However, during this period the buds responded to GA3 and chilling temp. The “post-rest” quiescent period was not reached until mid-February, at which time the buds no longer responded to GA3 or additional chilling and bud break occurred within 72 to 84 hours after exposure to the greenhouse environment.
The degree of inhibition of buds of the 2 cultivars varied throughout this study. ‘Redhaven’ buds were more inhibited than buds of ‘Redskin’ throughout the period studied.
Abstract
The effect of exposure of small peach plants (Prunus persica (L.) Batsch cvs. Redhaven and Redskin) to daily fluctuating temperatures (16 hours low: 8 hours high) of 6-15°, 6-18°, 6-21° and 6-24°C was examined in comparison with continuous chilling at 4° and a non-chilled control. Even though all chilling treatments received the same amount of chilling (weighted chilling hours), good leaf bud break was obtained only in the continuous 4°, 6-15° and 6-18° treatments. No lateral leaf buds opened in the 6-21°, 6-24° or the non-chilJed controls of both cultivars. The 6-15° temperature regime was more efficient than continuous chilling in breaking bud rest on a weighted chilling hour basis. ‘Redskin’ lateral buds were shown to have a higher chilling requirement than ‘Redhaven’. Terminal buds especially of ‘Redhaven’ showed a very low chilling requirement. Treating plants with 50 or 150 mg/liter GA3 slightly advanced bud break but did not affect the level of sprouting.
Abstract
Leaf bud break of ‘Redhaven’ and ‘Redskin’ peach (Prunus persica (L.) Batsch) following exposure of plants to temperature cycles of 1, 3, 6 and 9 days was examined. During each cycle the plants were exposed to 4°–6°C for 2/3 of the cycle length and 24° for the remaining 1/3 with all cycles repeated until the plants were exposed to a designated number of chilling hours. Thus, all plants within each treatment were exposed equally (in total) to chilling and heat. No lateral bud (LB) break occurred with ‘Redskin’ in the 1-day cycle, a low level was obtained in the 3-day cycle and good bud break occurred in the continuous chilling control and the 6 and 9 day cycles. With ‘Redhaven’ no LB break was evident in the 1 day cycle while the 3, 6, and 9 day cycles responded similar to the continuous chilling control. From these data it was concluded that chilling (4°-6°) accumulated during the 20 to 40 hrs prior to the onset of high temperature was susceptible to high temperature negation.
Abstract
Peach seed (Prunus persica (L.) Batsch, cv. Elberta) were stratified at 0°C in peat moss and analyzed for GA3 and GA7 at weekly intervals for 4 weeks and at 4 week intervals for 16 weeks. Percentage germination increased as GA3 and GA7 increased during stratification. The suggestion is made that there is a conversion of GA7 to GA3 during stratification and the biosynthesis is temperature dependent.