Siberian C Rootstock Delays Bloom of Peach 1

Abstract

Siberian C seedling rootstock delayed the bloom of 3 cultivars of peach (Prunus persica (L.) Batsch) as compared to seedling rootstocks Harrow Blood, Lovell, and Halford. Starting about 1 month before bloom, trees on Siberian C developed more slowly than those on other rootstocks as measured by flower bud moisture content. Bloom was delayed 5 days by Siberian C in both 1977 and 1978, with no adverse side effects.

Influence of Siberian C Rootstock on Peach Bloom Delay, Water Potential, and Pollen Meiosis1

“…However, there was a 4 day delay of bloom with cultivars propagated on Siberian C (Table 2). This delay in bloom development is associated with a delay in the increase in flower bud moisture content (14) and, in the present study, a delay in the increase in xylem water potential was observed.…”

“…The present study investigates the chilling completion date in more detail by monitoring the meiotic stage of the pollen mother cells. The previous report (14) also fol lowed the change in flower bud moisture content as the buds developed from dormancy to full bloom. Here we report on fur ther investigations into rootstock effects on the changing water status of the peach tree and its relation to flower development from dormant buds to petal fall.…”

“…The most promising technique appears to be evaporative cooling of the flower buds developed in Utah.2 It has been used with suc cess in dry climates, but has led to serious side effects in more humid areas with heavy soils (1,13). Recently, it has been re ported that the peach seedling rootstock Siberian C causes de lay of bloom in the scion cultivar for up to 6 days (14). This phenomenon is particularly interesting because Siberian C has also been reported to cause early scion defoliation and dormancy in the fall (9).…”

“…Young and Olcott-Reid (14) reported that greenhouse forc ing of fruiting shoots of 'Harken' and 'Cresthaven' propagated on Siberian C, Halford, and Lovell indicated that there was no difference among rootstocks with respect to the date that chill ing was completed. The present study investigates the chilling completion date in more detail by monitoring the meiotic stage of the pollen mother cells.…”

Effects of Shoot, Root, and Shank Chilling during Rest in Apple and Peach on Growth Resumption and Carbohydrates

“…The effect on shoot growth was not reported. Although timing of spring budbreak appears to be determined primarily by the scion (4), rootstock influences on scion budbreak have been reported in pear (21), peach (23), and apple (3). Very little has been done to investigate the effects of chilling the root during dormancy on budbreak and resumption of shoot growth.…”