The experiment was aimed to know the effect of BAP Plant Regulator to the formation and the development of Potato’s Micro Tuber. The treatment were 0; 2,5; 5; 7,5 mg/L BAP. The growing media was Murashige and Skoog (MS0). The result showed that BAP did not significantly affected the number, diameter, wet and dry weight of the tuber. However, the highest of number, diameter, wet and dry weight was found at the 7,5 mg/L BAP. The fastest formation of tuber was yielded in 5 mg/L BAP.
Abstract. Yater T, Tubur HW, Meliala C, Abbas B. 2019. Short Communication: A comparative study of phenotypes and starch production in sago palm (Metroxylon sagu) growing naturally in temporarily inundated and non-inundated areas of South Sorong, Indonesia. Biodiversitas 20: 1121-1126. Sago palm forests and sago palm semi cultivation are generally spread in swampy areas, seasonally inundated areas and non-inundated areas. The objectives of this study are to determine and compare the phenotypes of and starch production by sago palms growing naturally in the temporarily inundated areas (TIA type) and non-inundated areas (WIA type) in South Sorong District, West Papua Province, Indonesia. Sago palms of both habitats were found to be the same variety based on analysis of vernacular names and general characteristics. Comparison of morphological characters related to starch production of TIA and WIA types showed that there were no significant differences between the two studied types. The distribution of starch along the sago trunk was observed to be uneven, higher starch accumulation was found in the middle part of the trunk which was significantly different from the lower and upper parts of the trunk.
This study aims to observe the growth of breadfruit root cuttings due to a combination of planting media and the application of growth regulators. The research was carried out experimentally using a randomized block design with 9 treatments, namely soil, soil + PGR soaking, soil + PGR powder dipping, husk + soil, husk + soil + PGR soaking, husk + soil + PGR powder dipping, sand + soil, sand + soil + PGR soaking, sand + soil + PGR powder dipping. The data obtained were analyzed statistically and test futhered by Tukey's honestly significant difference. The results found that there were significant different in the characters of shoot time, shoot length 1-6 WAP, number of shoots, and number of roots. The treatment of soil media and PGR dipping performed the fastest shoot time. On the other hand, a mixture of soil with husk and ZPT given by soaking showed the best shoot length. The most roots number was produced by the the cuttings planting in sand and treated by dipping PGR.
The aim of this study was to measure the resistance of several sweet potato genotypes to C. formicarus Fabricus (Coleoptera: Curculionidae) attack. The design used in this study was a randomized block design (RAK) with 9 treatments and 3 replications, so that 27 experimental units were obtained. The genotype treatmens were Antin 1, Antin 2, Antin 3, Koya 2, Koya 4, Koya 6, Beta 2, Kidal, and Salosa. The results of the analysis showed that all of the tested genotypes were naturally damaged by C. formicarius pests both at the base of the stem and on the tubers. The intensity of tuber damage caused by C. formicarius among 9 tested genotypes was the highest in the Salosa genotype (17.593%) and the lowest was in the Antin 1 genotype (5.553%). The intensity of damage to the base of the stem caused by C. formicarius among the 9 genotypes tested was the highest in the Antin 1 genotype (61.110%) and the lowest was in the Left-handed genotype (47,333%). Colonization (infestation) of C. formicarius in the test genotype occurred from the beginning of the observation at 4 week until the plants were harvested (tubers formed). The egg and larvae populations in this study were not found, while the number of imago from each test genotype was different with the highest population was in the Antin 1 genotype (3,3200 individuals), then the lowest imago population was in the Antin 3 and salosa genotypes with an average value of 2.1467 individuals. The resistant genotypes were Koya 4, Salosa, and Beta 2, while genotypes that were moderately resistant were Koya 2, Kidal, Antin 3, but Antin 2, Koya 6 and Antin 1 were sensitive genotypes.
<em>The objective of this experiment was to identify the growth and production responses of rice genotypes to drought period. Rice plants were grown under plastic house in plots separated by a massive walls and water was suplied by inlet pipe line. Drought treatments were placed as main-plot, consisted of K3, K6, K9 (water was supplied till 3, 6, and 9 weeks after rice transplanting (WAT), respectively) and control (standard rice growing without drought treatment).� Rice genotypes were placed as sub-plot, consisted of IR-64 and Ciherang (low land type improved varieties), IPB-97 (new plant type), Menthik Wangi (an aromatic local low land rice), Rokan (a hybryd rice), Way Apo Buru (amphibian type), Jatiluhur and Silugonggo (up land type). The results showed that rice growth and yield were significantly affected by drought treatment, especially in K3 and K6. Low yield in K3 and K6 were mostly caused by increased of unfilled spikelet. Jatiluhur, Ciherang and Way Apo Buru still showed relatively high yield under drought stress indicated that those genotypes were relatively tolerant to drought stress; Silugonggo and IPB-97 showed relatively medium tolerant to drought stress; IR-64, Menthik wangi and Rokan showed the most sensitive one.</em>
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