Effects of Night Break and Temperature Treatment on Growth and Flowering of ‘Taoyuan No. 3’ Strawberry (Fragaria ×ananassa Duch.)
Date Issued
2014
Date
2014
Author(s)
Chen, Ko-Hsin
Abstract
Fragaria ×ananassa Duch. ‘Taoyuan No. 1’ and F. ×ananassa Duch. ‘Taoyuan No. 3’ are the main strawberry cultivars planted in Taiwan. The harvest season is from November to April. This study aims to figure out how night break and cold storage treatments affect growth and flowering on strawberry ‘Taoyuan No. 3’, and attempts to find the optimum way to regulate production season and produce out of season strawberries. After applying seven months of night break treatment and a period of cold storage, strawberry ‘Taoyuan No. 3’ plants were placed outdoor condition in July. The result showed that plants were planted in pot with cold storage treatment had better growth poteneial, larger leaf area, longer petiole length, and more increased runner numbers. Withou cold storage treatment, there were no runners increased. All the groups reached 100% of flowering plant proportion except the group placed at 10℃ without light (10D); Plants without cold storage treatment had the most accumulated inflorescences－1.6 inflorescences. The next was the plants placed at 10℃ with light (10L), which had 1.3 inflorescences. It showed that cold storage treatment had less influence on flowering. Strawberry ‘Taoyuan No. 3’ could blossom in summer in Taipei after night break treatment. To know how different temperature treatments influenced growth and flowering after night break, each group of plants was planced outdoor or at day/night temperatures of 30/25℃, 25/20℃, 20/15℃, and 15/10℃. Plants which were treated with night break didn’t sprout inflorescences eight weeks latter, even though plants without night break treatment only increased 0.4 inflorescences at 30/25℃ and 15/10℃. Therefore, 15/10℃ and outdoor groups were moved into higher temperature condition (30/25℃ and 25/20℃). Plants treated with night break started sprouting inflorescence after eleven weeks higher temperature treatment, while plants without night break treatment sprouted inflorescence immediately. After night break treatment, four temperature (15/13℃, 20/15℃, 25/20℃, and outdoor condition) were applied to strawberry ‘Taoyuan No. 3’ plants for four weeks, then they were moved into optimum flowering temperature (20/15℃). Plants treated with night break germinated about 1.6 runners but no inflorescence, significantly differed from plants without night break treatment, which had only 0.2 runners but germinated 1 inflorescence. Plants with night break treatment would finally sprout inflorescence after placing them at optimum flowering temperature 20/15℃for seven weeks.
Subjects
cold storage
bare root plant
accumulated inflorescences
out of season strawberries
runners
Type
thesis
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