Sweet Cherry (<i>Prunus avium</i>L.) Fruit Drop Reduction by Plant Growth Regulators (Naphthalene Acetic Acid NAA and Gibberellic Acid GA₃)

This study was conducted during 2019/2020 on sweet cherry trees (Prunus Avium L.) (Bing and Hardy Giant) cultivar planted at Sergaya-Al_Zabadani area of Rural Damascus, to reduce fruit drop of sweet cherry. The experiment included 4 foliar applications: T1: control, T2: GA3 (100 ppm), T3: NAA (20 ppm), T4: (100 ppm GA3 + 20 ppm NAA). Fruit set and fruit drop percentage, fruiting factor, and yield were recorded. The results showed that treatment with (100 ppm GA3 + 20 ppm NAA) recorded higher fruit set percentage (73.81% and 75.62%), and fruiting factor (48.38% and 50.04%) respectively; In addition to fruit yield (40.19 and 41.21 kg/tree) for both cultivars, compared to the control (9.13, 6.60 kg/tree). Therefore, it can be concluded that GA3 + NAA treatment reduced Sweet cherry fruit drop better than other treatments, where fruit drop percentage didn’t exceed (63.11% and 62.01%) in both cultivars (Bing and Hardy Giant) respectively, compared to the control (80.92% and 80.64%).

Effects of Gibberellic Acid (GA_(3)) and Salicylic Acid (SA) postharvest treatments on the quality of fresh Barhi dates at different ripening levels in the Khalal maturity stage during controlled atmosphere storage

Barhi dates at Khalal maturity stage are well-known with their pleasant taste,crispy texture,and bright yellow color.It is necessary to extend the duration of Barhi Khalal stage which is too short for effective marketing.This study aimed to inspect the effects of Gibberellic Acid(GA_(3))and Salicylic Acid(SA)postharvest treatments on retaining the high quality of Khalal Barhi fruits during controlled atmosphere storage.Fresh samples of Barhi fruits at Khalal stage harvested at three different ripening levels were dipped after harvesting in GA3(150 ppm)or SA(2.0 mmol/L)and subsequently stored in controlled atmosphere(0°С,5%O_(2),5%CO_(2),80%±5%RH).The results revealed that the GA_(3) and SA treatments reduced the percentage of weight loss and decay in the fruits,while the total soluble solids increased.Moreover,GA_(3) and SA treatments were significantly efficient in limiting the changes in fruit color and texture of Barhi dates compared to the control.Sensorial results support the experimental data and disclosed that the GA_(3)(150 ppm)treatment in the controlled atmosphere(CA)storage was better in conserving the quality of Barhi at the Khalal maturity stage and delaying ripening process.

Separation of gibberellic acid (GA3) by macroporous adsorption resins

The adsorption effects of several macroporousadsorption resins for gibberellic acid (GA3) were investigated.The dynamic adsorption capacity is 58.38 mg/g drybeads for resin R4 and 96.46 mg/g dry beads for resin R5which is consistent with the surface area. Aqueous methanol(50%, V/V) is a good eluent and the yield of GA3 isabove 95%. The concentration of GA3 could increase fivefoldafter an adsorption-elution cycle and this is importantwhen considering further crystallization of GA3 in anindustrial process.

赤霉素及矮壮素对高羊茅生长特性及品质的影响

采用３ 种不同浓度的赤霉素（２０、５０、１００ μｇ／ｇ）和矮壮素（５００、１ ０００、１ ５００ μｇ／ｇ）对高羊茅进行叶面喷施，以研究其对高羊茅生长特性及品质的影响。结果表明：赤霉素显著促进地上部分伸长生长，１００ μｇ／ｇ 赤霉素处理生长速度最快。５０ μｇ／ｇ 赤霉素处理高羊茅的干草产量及粗蛋白产量均最高，分别为对照的２．０１、１．８４ 倍。矮壮素抑制地上部分的伸长生长，并促进分蘖，使叶片加宽。１ ５００ μｇ／ｇ 矮壮素处理的高羊茅干草产量、粗蛋白产量分别比对照提高２１．８７％ 、４０．８６％ 。赤霉素处理使高羊茅粗纤维含量有所提高，粗蛋白含量比对照有所下降。矮壮素处理使高羊茅粗蛋白含量提高，粗纤维含量降低。

赤霉酸和氯吡脲处理对夏黑葡萄果实品质的影响

筛选适合贵州地理气候条件下夏黑葡萄优质、高产的最佳无核膨大处理方式,为推进夏黑葡萄产业的持续健康发展提供技术支持,以3年生夏黑葡萄为试验材料,在花前1周、盛花末期及花后1周利用不同浓度赤霉酸(GA3)和氯吡脲(CPPU)处理花穗,研究其对葡萄果实品质的影响。结果表明:盛花末期采用20mg/L GA3+花后1周采用50mg/L GA3对夏黑葡萄浸蘸果穗的处理效果较好,其果实单粒重、果粒纵横径及穗重较对照(清水处理)显著增加,在可溶性固形物、可溶性糖及糖酸比等内在品质方面表现较好,是夏黑葡萄优质、高产的最佳无核膨大处理方式。

植物生长调节剂IAA、GA和6-BA对芥菜型油菜和甘蓝型油菜富集镉的强化

重金属植物提取修复效率受到植物体内重金属含量和植物生物量的影响。利用植物生长调节剂可作为强化植物修复效率的一种调控措施。本实验以芥菜型油菜(Brasscia juncea)和甘蓝型油菜(B.napus)为对象,研究了植物生长调节剂IAA、GA和6-BA单独或两两联合作用对这两种油菜富集镉的调控作用。研究结果显示:这3种植物生长调节剂对这两种油菜株高和生物量的影响不同,显著增加芥菜型油菜株高和生物量,却显著降低甘蓝型油菜株高和生物量。同时,这3种植物生长调节剂可显著提高芥菜型油菜和甘蓝型油菜的镉含量和植物积累镉量,这两种类型油菜积累的镉主要集中在茎和叶。植物生长调节剂处理的芥菜型油菜和甘蓝型油菜的镉转运系数和生物富集系数都大于对照,并且可增强油菜吸收镉和促进镉向茎和叶转移。IAA与GA或6-BA联合作用可协同强化油菜提取镉。