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Paclobutrazol Improves Sesame Yield by Increasing Dry Matter Accumulation and Reducing Seed Shattering Under Rainfed Conditions
International Journal of Plant Production ( IF 2.5 ) Pub Date : 2021-02-12 , DOI: 10.1007/s42106-021-00132-w
Muhammad Zeeshan Mehmood , Ghulam Qadir , Obaid Afzal , Atta Mohi Ud Din , Muhammad Ali Raza , Imran Khan , Muhammad Jawad Hassan , Samrah Afzal Awan , Shakeel Ahmad , Muhammad Ansar , Muhammad Aqeel Aslam , Mukhtar Ahmed

Several biotic and abiotic stresses significantly decrease the biomass accumulation and seed yield of sesame crops under rainfed areas. However, plant growth regulators (such as Paclobutrazol) can improve the total dry matter and seed production of the sesame crop. The effects of the paclobutrazol application on dry matter accumulation and seed yield had not been studied before in sesame under rainfed conditions. Therefore, a two-year field study during 2018 and 2019 was conducted with key objectives to assess the impacts of paclobutrazol on leaf greenness, leaf area, total dry matter production and partitioning, seed shattering, and seed yield of sesame. Two sesame cultivars (TS-5 and TS-3) were treated with four paclobutrazol concentrations (P0 = Control, P1 = 100 mg L−1, P2 = 200 mg L−1, P3 = 300 mg L−1). The experiment was executed in RCBD-factorial design with three replications. Compared with P0, treatment P3 improved the leaf greenness of sesame by 17%, 38%, and 60% at 45, 85, and 125 days after sowing, respectively. However, P3 treatment decreased the leaf area of sesame by 14% and 20% at 45 and 85 days after sowing than P0, respectively. Compared with P0, treatment P3 increased the leaf area by 46% at 125 days after sowing. On average, treatment P3 also improved the total biomass production by 21% and partitioning in roots, stems, leaves, capsules, and seeds by 23%, 19%, 23%, 22%, and 40%, respectively, in the whole growing seasons as compared to P0. Moreover, under P3 treatment, sesame attained the highest seed yield and lowest seed shattering by 27% and 30%, respectively, compared to P0. This study indicated that by applying the paclobutrazol concentration at the rate of 300 mg L−1 in sesame, the leaf greenness, leaf areas, biomass accumulation, partitioning, seed yield, and shatter resistance could be improved. Thus, the optimum paclobutrazol level could enhance the dry matter accumulation and seed production capacity of sesame by decreasing shattering losses under rainfed conditions.



中文翻译:

多效唑可通过增加干物质积累并减少雨养条件下的种子破裂来提高芝麻产量。

在雨育地区,几种生物和非生物胁迫显着降低了芝麻作物的生物量积累和种子产量。但是,植物生长调节剂(例如多效唑)可以改善芝麻作物的总干物质和种子产量。以前在雨养条件下,未研究过多效唑施用对干物质积累和种子产量的影响。因此,在2018年和2019年进行了为期两年的野外研究,其主要目标是评估多效唑对叶片绿色度,叶片面积,总干物质生产和分配,种子破碎以及芝麻种子产量的影响。用四个多效唑浓度(P0 =对照,P1 = 100 mg L -1,P2 = 200 mg L -1)处理两个芝麻品种(TS-5和TS-3),P3 = 300毫克L -1)。实验在RCBD因子设计中执行,重复了3次。与P0相比,处理P3在播种后第45、85和125天分别使芝麻的叶片绿度提高了17%,38%和60%。然而,在播种后第45天和第85天,P3处理的芝麻叶面积分别比P0减少了14%和20%。与P0相比,P3处理在播种后125天增加了46%的叶面积。平均而言,在整个生长过程中,处理P3还使总生物量提高了21%,根,茎,叶,荚膜和种子中的分配分别提高了23%,19%,23%,22%和40%。与P0相比 此外,与P0相比,在P3处理下,芝麻的最高籽粒产量和最低的种子破碎率分别达到27%和30%。芝麻中的-1可以改善叶片的绿色度,叶片面积,生物量积累,分配,种子产量和抗碎裂性。因此,最佳的多效唑水平可以通过减少在雨水条件下的粉碎损失来提高芝麻的干物质积累和种子生产能力。

更新日期:2021-02-15
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