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Manipulation of flowering, fruiting and postharvest handling techniques in litchi
|關鍵字:||技術發展;fruit quality;園藝;果實品質;疏花序;著果;荔枝;保鮮;貯運;激勃素;花序形成;疏花;inflorescence thinning;fruit set;litchi;fresh-keeping;storage and transportation;GA3;inflorescence formation;flower thining||摘要:||
1. Effects of inflorescence thinning on yield and fruit quality in '73-S-20' litchi
Inflorescence thinning has been reported as a novel technique to remarkably improve fruit production in “Yu Her Pau” litchi (Litchi chinensis Sonn.) in Taiwan. However, the results were inconsistent, the mechanism is unclear and the labor cost is high. To investigate this effect on fruit production in 73-S-20 litchi, an elite branch of No Mai Tsz found by Yen et al (1984), selected inflorescences of 11 to 12 year old field trees grown in Changwa were hand thinned by removing most branches of each inflorescence right before the beginning of the first flowering wave in two consecutive years. Fruit retention, leaf to fruit ratio and emergence of new flush per cluster were calculated during fruit developing period. Fruit yield per cluster and their characteristics were examined at harvest. From the data we will obtain a source/sink relationship during fruit growth in litchi, and thus a potential orchard management strategy to reduce fruit drop and enhance yield can be developed as well.
2. Studies on post-havest handling of litchi in Taiwan
Litchi is one of the important economic fruit in Taiwan. The amount of exported fruit in 2009 was 1,339 MT. The litchi exportation was stabilize domestic price and increase the revenues benefit. The browning and decay were main problems during litchi postharvest chain, therefore, the development of exported market was limited. The research focus on the problems during litchi postharvest and develop new postharvest techniques. Depend on the results of program (postharvest pericarp browning control and improvement of fresh-keeping techniques on Litchi fruits) in 2010, the procooling, different chemicals (chitosan and Na2S2O5) and package way were significantly prolong storage life of litchi. Therefore, the research is going to continue to following the research last year and confirm the results by these treatment. It expected to develop new postharvest techniques for litchi industry.
3. Effect of GA3 treatment on growth and development of ‘Yu Her Pau' litchi during flower induction
Late vegetative flush and inflorescence thinning during the cultivation
of ‘Yu Her Pau' litchi (Litchi chinensis Sonn) is highly laborintensive. Applying GA3 at certain intervals has been proven effective in reducing flowering intensity in mango and avocado trees. The objective of this study is to investigate the effects of GA3 application timing and hand inflorescence thinning on ‘Yu Her Pau' litchi fruiting. In this study, ‘Yu Her Pau' litchi trees were separated into seven separate groups. Six groups of trees received 100 mg/L GA3 foliar sprays at different times during inflorescence induction and one control group did not receive any application of GA3. Afterwards, all trees in the study were hand-thinned to selectively reduce the number of flowers on each inflorescence. The results of this study showed that ‘Yu Her Pau' litchi trees receiving application of GA3 did not require hand inflorescence thinning and produced a greater litchi yield. Additionally, the application of GA3 at specific times were shown to produce a yield much greater than trees cultivated using traditional methods of hand inflorescence thinning.
1. 疏花序對糯米糍(73-S-20)荔枝著果與果實品質之影響 疏花序已被用於改善’玉荷包’荔枝之著果，但其效益不一、機制未明且所費不貲。近年該技術亦被用於中部之’73-S-20’果園，然其成效需科學性之評估。為探討疏花序能否影響該品系之果實生產及釐清其可能原因，本試驗擬連續兩年（民國101年至102年）於彰化縣芬園鄉簡氏之11至12年生果園（行株距5m×5m）選擇供試植株的部份開花枝條為樣品。仿果農之作業方式，在第一波小花綻放前將花序修剪至僅留2-3主枝，調查對著果、葉果比、結實期萌梢率及果實性狀之影響。預期試驗成果可為荔枝結實生理及田間栽培管理之參考，並據以賡續發展保果策略。
’玉荷包’荔枝(Litchi chinensis Sonn.)生產過程中疏晚梢與疏花需耗費大量人力。本試驗欲探討不同時間處理GA3與人工疏花對’玉荷包’荔枝結果之影響，將’玉荷包’荔枝花序誘導過程，分成六個不同時間，每次對不同組植株葉面噴施100 mg/L GA3，對照組不以GA3處理，開花後對所有植株部份之條行人工修剪花序。試驗結果顯示，經處理GA3後無需人工疏花處理，即可提升’玉荷包’荔枝產量，特定時間處理GA3更可使結果數大於僅以人工修剪之一般生產方式。
|Appears in Collections:||園藝學系|
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