Effects of pruning and temperature on vegetative and reproductive growth of waxapple

• Main Authors: Hsiao, Cheng-Hung, 蕭政弘
• Other Authors: Tzong-Shyan Lin
• Format: Others
• Language: zh-TW
• Published: 1997
• Online Access: http://ndltd.ncl.edu.tw/handle/00941086491657213445

碩士 === 國立臺灣大學 === 園藝學系研究所 === 85 === Light, moderate and severe pruning were applied on 20-year-old waxapple plants after harvest on late Feburary, 1995 to study the effect of pruning on vegetative and reproductive growth. The ability of sprouting , the frequency of flushing, or the flush number on each node was increased with enhancing pruning severity. Severe pruning resulted in more new flushes with shorter stems and smaller leaves. Accompanying with flushing or new shoot growth, leaf area index and light interception increased to their maximum values in late August. Severe pruning owned the least values in the early season but reached same level as moderate or light pruning in August. After the flower forcing treatment, i.e., trunk girdling and partial defoliation, high percentage of inflorescences formed on all treated plants. Most of the inflorescences were transformed from the shoot apex on the first flushes which sprouted after pruning. Some inflorescences transformed from the terminal or lateral parts of one-year-old lateral shoots of moderately or lightly pruned plants. These results suggested that pruning influenced sprouting, flushing, morphology of flush, and light interception but nil on flowering capability.In the view-point of flush management, moderate pruning was recommended for waxapple after harvest. Three-year old potted waxapple plants were introduced into the phytotron with different day/night temperature（35/25,30/20 and 25/15℃）to investigate the influence of temperature on shoot growth and flowering.The time required for flush growing to maximal stem length,leaf area and chlorophyll content was shortened with increasing temperature.For an individual flush,plants under low temperature 25/15℃）exhibited the highest shoot length,shoot diameter and single leaf area. On the other hand, plants under highesst temperature(35/25℃)had the highest frequency of flushing, highest total shoot growth and largest canopy. The percentage of inflorescence formations was highest under 35/25℃ and lowest under 25/15℃. No significant difference on diurnal leaf water potential was noted among different treatments. Starch concentration in the stem and leaves was higher whereas soluble sugar concentration was lower at low temperature than those at high temperature. The relations among temperature, shoot growth, carbohydrate levels and flowering were discussed.