English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Flower buds of 20 Prunus species representing 4 subgenera were collected during winter and spring of 1989-90. Buds were preconditioned at +3° or 7°C to test their minimum hardiness level (MHL) or the rate of hardiness increase. DTA revealed that most of the prunus species have flower primordia that supercool. The subgenus Padus have racemose inflorescences and do not deep supercool during dormancy.  P. besseyi, P. nigra  and  P. americana  had small exotherms between -22° and -27°C while  P. davidiana  and  P. subhirtella  had larger exotherms at higher temperatures. Exposure of flower buds to -7°C shifted LTE S  to lower temperatures and/or reduced the size of LTE, which became undetectable for many species including  P. nigra  and  P. americana. P. davidiana  and  P. subhirtella  increased hardiness by 6°/day at -7° while dormant. Deacclimation coincided with an increase in LTE 50  and the development of xylem vessel elements in the bud axis, calyx and filaments as indicated by dye movenent.  P. davidiana  was the least hardy species and required only 700 chill units to satisfy the chilling requirement, while  P. nigra  and  P. americana  had LTE average of -26°C at MHL and required over 1000 chill unit accumulation.

VARIATIONS IN COLD HARDINESS CHARACTERISTICS AMONG PRUNUS SPECIES