Rates and Times at Which Needles are Initiated in Buds on Differing Provenances of Pinuscontorta and Piceasitchensis in Scotland

1975 ◽  
Vol 5 (3) ◽  
pp. 367-380 ◽  
Author(s):  
M. G. R. Cannell ◽  
S. C. Willett
Keyword(s):  
Temperature Sensitivity ◽  
Photoperiod Sensitivity ◽  
Extension Growth ◽  
Axillary Bud ◽  
Bud Formation ◽  
Bud Development ◽  
Apical Dome ◽  
Seed Origin ◽  
Terminal Buds

During 1973, bud formation was monitored by sampling terminal buds from the topmost branches on four provenances plus one interprovenance hybrid of 10-year-old Pinuscontorta, and five provenances of 8-year-old Piceasitchensis, all growing in forest trials in Scotland. On both species, extension growth occurred between late May and mid-July. On pine, buds began forming in April; about a third of next year's needles (axillary bud primordia) were formed before mid-July and all were formed by mid-September. On spruce, bud formation occurred from May to October.Northerly and inland montane provenances began producing primordia earlier in spring than southerly provenances, suggesting differences in temperature sensitivity. The dates when bud development ceased were more closely related to latitude of seed origin, suggesting differences in photoperiod sensitivity. Differences among pine provenances in total numbers of primordia formed were related to differences in maximum rates of initiation during the summer, whereas in spruce they were due to differences in seasonal duration. In all cases, rates of initiation were closely correlated with apical dome diameters. Implications are noted regarding conifer breeding and environment–genotype interactions.

scholarly journals The miR156 -SPL4 module predominantly regulates aerial axillary bud formation and controls shoot architecture

2017 ◽  
Vol 216 (3) ◽  
pp. 829-840 ◽  
Author(s):  
Jiqing Gou ◽  
Chunxiang Fu ◽  
Sijia Liu ◽  
Chaorong Tang ◽  
Smriti Debnath ◽  
...  
Keyword(s):  
Axillary Bud ◽  
Bud Formation ◽  
Shoot Architecture

Timing and rate of bud formation in Pinus resinosa

1971 ◽  
Vol 49 (10) ◽  
pp. 1821-1832 ◽  
Author(s):  
Edward Sucoff
Keyword(s):  
Quantitative Data ◽  
Shoot Growth ◽  
Pinus Resinosa ◽  
Growing Season ◽  
Axillary Buds ◽  
Growing Degree Days ◽  
Degree Days ◽  
Bud Formation ◽  
Late Season ◽  
Apical Dome

During the 1969 and 1970 growing season buds were collected almost weekly from matched trees in northeastern Minnesota. Cataphyll primordia for the year n + 1 shoot began forming at the time that internodes in the year n shoot started elongating (late April) and continued forming until early September. Primordia for axillary buds started forming about 2 months later and stopped forming at the same time as cataphylls. The size and deposition activity of the apical dome simultaneously increased during the early growing season and decreased during the late season. The maximum rates in July were over nine cataphylls per day.Rate of cataphyll deposition paralleled elongation of the needles on subtending shoots. Forty to fifty percent of the cataphylls had been formed when shoot growth was 95% complete. Although the bulk of the depositions occurred earlier in 1970, when growing degree days were used as the clock, the 2 years were similar.The results provide quantitative data to complement the histologic emphasis of previous studies.

Gibberellin repression of axillary bud formation inArabidopsisby modulation of DELLA‐SPL9 complex activity

2020 ◽  
Vol 62 (4) ◽  
pp. 421-432 ◽  
Author(s):  
Qi‐Qi Zhang ◽  
Jia‐Gang Wang ◽  
Ling‐Yan Wang ◽  
Jun‐Fang Wang ◽  
Qun Wang ◽  
...  
Keyword(s):  
Axillary Bud ◽  
Complex Activity ◽  
Bud Formation

Bud development in mountain hemlock (Tsuga mertensiana). I. Vegetative bud and shoot development

1984 ◽  
Vol 62 (3) ◽  
pp. 475-483 ◽  
Author(s):  
John N. Owens
Keyword(s):  
Growth Cycle ◽  
Shoot Development ◽  
Bud Development ◽  
Vegetative Buds ◽  
Lateral Shoots ◽  
Tsuga Mertensiana ◽  
Terminal Buds ◽  
Lateral Branches ◽  
Relationship Of ◽  
Vegetative Bud

Vegetative buds of mature Tsuga mertensiana (Bong) Carr. (mountain hemlock) were studied throughout the annual growth cycle. Cell divisions began in vegetative buds in mid-April and shoots and leaves elongated within the bud scales causing the buds to burst in late June. Lateral shoots completed elongation by the end of July. Vegetative terminal apices from lateral branches began bud-scale initiation when bud dormancy ended. All bud scales were initiated by the end of July. Leaf primordial initiation occurred from that time until mid-October when vegetative buds again became dormant. Axillary buds were initiated on the elongating shoots in early June then followed the same phenology as vegetative terminal buds. Vegetative bud and shoot development are compared with that of western hemlock and certain other members of the Pinaceae. The relationship of bud development to shoot development is discussed for mountain hemlock and other conifers having a similar pattern of vegetative bud development.

scholarly journals From bud formation to flowering: transcriptomic state defines the cherry developmental phases of sweet cherry bud dormancy

BMC Genomics ◽  
2019 ◽  
Vol 20 (1) ◽  
Author(s):  
Noémie Vimont ◽  
Mathieu Fouché ◽  
José Antonio Campoy ◽  
Meixuezi Tong ◽  
Mustapha Arkoun ◽  
...  
Keyword(s):  
Sweet Cherry ◽  
Cell Activity ◽  
Transcriptomic Analysis ◽  
Bud Dormancy ◽  
Diagnostic Tools ◽  
Dormancy Release ◽  
Cold Response ◽  
Bud Formation ◽  
Bud Development ◽  
Transcriptional Changes

Abstract Background Bud dormancy is a crucial stage in perennial trees and allows survival over winter to ensure optimal flowering and fruit production. Recent work highlighted physiological and molecular events occurring during bud dormancy in trees. However, they usually examined bud development or bud dormancy in isolation. In this work, we aimed to further explore the global transcriptional changes happening throughout bud development and dormancy onset, progression and release. Results Using next-generation sequencing and modelling, we conducted an in-depth transcriptomic analysis for all stages of flower buds in several sweet cherry (Prunus avium L.) cultivars that are characterized for their contrasted dates of dormancy release. We find that buds in organogenesis, paradormancy, endodormancy and ecodormancy stages are defined by the expression of genes involved in specific pathways, and these are conserved between different sweet cherry cultivars. In particular, we found that DORMANCY ASSOCIATED MADS-box (DAM), floral identity and organogenesis genes are up-regulated during the pre-dormancy stages while endodormancy is characterized by a complex array of signalling pathways, including cold response genes, ABA and oxidation-reduction processes. After dormancy release, genes associated with global cell activity, division and differentiation are activated during ecodormancy and growth resumption. We then went a step beyond the global transcriptomic analysis and we developed a model based on the transcriptional profiles of just seven genes to accurately predict the main bud dormancy stages. Conclusions Overall, this study has allowed us to better understand the transcriptional changes occurring throughout the different phases of flower bud development, from bud formation in the summer to flowering in the following spring. Our work sets the stage for the development of fast and cost effective diagnostic tools to molecularly define the dormancy stages. Such integrative approaches will therefore be extremely useful for a better comprehension of complex phenological processes in many species.

Sign in / Sign up

Export Citation Format

Share Document