Abstract. Rosmaina, Elfianis R, Almaksur A, Zulfahmi. 2021. Minimal number of morphoagronomic characters required for the identification of pineapple (Ananas comosus) cultivars in peatlands of Riau, Indonesia. Biodiversitas 22: 3854-3862. Pineapple (Ananas comosus L Merr)  is a tropical fruit that has high economic value. In Riau Province, Indonesia, pineapples grow and produce well on various types of land, including the highly acidic peatland. There are many types of pineapples grown by  from generation to generation, but so far, there have been no reports regarding the diversity of pineapples in peatlands. This study aimed to determine the minimal number of characters distinguishing pineapple morphological and agronomic characters in peatlands. The observations were done on 24 local genotypes of pineapple in peatlands. Characterization were carried out on 49 morphological and agronomic characters according to the Pineapple descriptor from the International Board for Plant Genetic Resources (IBPGRI). The data were analyzed by Multivariate Analysis, in which the principal components analysis was used for qualitative and quantitative traits. Based on the results of this study, there were at least 12 characters proposed to describe pineapple in peatlands, viz. seven qualitative characters (fruit base leaf color (collar), fruit shape, bractea color, fruit eye profile, fruit eye surface, flesh color, crown attachment to fruit) and five quantitative characters (fruit weight, fruit flesh weight, plant height, number of leaves and leaf length). Out of the 49 traits observed,  12 selected characters can be used as a minimal number of characters that can be used to identify pineapple cultivars on peatland. The findings of this research are rewarding for the conservation and management of genetic resources, selection, and breeding activities of pineapple plants.

The growth and fruit quality of the crop is strongly influenced by the environment in which it grows. The purpose of this study was to observe the growth and fruit quality of pineapple (Ananas comusus L. Merr) cv. Queen that cultivated in the three different ecosystems. Pineapple cv. Queen was planted in three different ecosystems, namely in freshwater peatlands, brackish water peatlands and Alluvial soils in Riau province. Morphology and fruit quality characters of pineapple were evaluated at each ecosystem. The result of this study displayed that pineapple cultivated in freshwater peatland having fruit weight (1540.64 g), fruit length (19.80 cm), sucker number (4.94 pieces), slip number (3.16 pieces), total dissolve content (14.19°Brix), titratable acidity (TA) (0.51%), and water content (85.94%) higher than others site. Morphology and fruit quality characters of pineapple that cultivated in brackish water peatlands and alluvial soils were not significantly different. Our finding of this study that pineapple grows well on three soil types and is adaptive in peatland so that pineapple can be selected as an alternative crop to be developed in the peatland in the future.

Rice is a cereal crop that belongs to the graminae family of high economic value, and is the main food for more than a portion of the world's population. This study aims to determine the relationship genetic of rice in Kampar by RAPD marker. Eight genotypes of rice from district in Kampar were amplified using eight primers (OPA 5, OPB 7, OPC 19, OPD 2, OPD 3, OPD 8, OPD 11, and OPD 13). The analysis of molecular data was performed by using NTSys pc -2.02 and GenAlex 6.1 . The results of the amplification of rice produced 48 loci with DNA band sizes obtained ranging from 350-1700 bp. The average percentage of polymorphic loci of the eight primers was 49.80%, where the highest percentage of polymorphic loci produced by OPA-7 primer was 75%, while the lowest polymorphic locus percentage was observed in OPD-13 primer which was 14.28%. The value of genetic distance between rice from Kampar in this study is in the range of 0.06 - 0.37. At a genetic distance of 0.79, rice plants can be grouped into two groups, namely the first group consisting of sokan and coku. The second group consisted of suntiong, korean , cupak putio, kuniong, jangguik, and cupak tenggi. The results of this study are expected to be taken into consideration in developing rice breeding strategies in the future.

Christmas palm is a plant that has high economic value as an ornamental plant and is in great demand. Christmas palm seeds begin to germinate 3-4 weeks after planting, slow germination because of to seeds experiencing physical dormancy. To break dormancy can be done by scarification and immersion GA3. The purpose of this study was to determine the effect of scarification and GA3 on the germination and growth of christmas palm seedlings and the interaction between the two treatments. This research was carried out from December 2017 to March 2018 on experimental Field and Agronomy Laboratory Faculty of Agriculture and Animal Science State Islamic University Sultan Syarif Kasim Riau. The method used Randomized Complete Block Design (RCBD) with two factors and four replications. The first factor was the scarification (control and with scarification) and the second factor is immersion GA3 (0 ppm, 150 ppm, 300 ppm and 450 ppm). The results showed that scarification by means of sandpaper can increase the growth rate and height of the christmas palm plant.The dipping of GA3 with concentration of 450 ppm for 2 hours is the best concentration for growth speed. There was no interaction between scarification and GA3 immersion on all observational parameters both in germination and in the nursery of chritmas palm plants on the land.

Pineapple is a tropical fruit that has high economic value. Mutation is a method to increase plant diversity which plays an essential role in plant improvement. This study aimed to induce mutations in pineapple using colchicine. This study was arranged in a factorial completely randomized design. The first factor was pineapple genotypes (i.e., Gemilang, Bangka, Queen, and Suska Kualu) and the second factor was colchicine concentration (i.e., 0.03%, 0.04%, 0.05%, and control). There were 16 treatments with five repetitions so the total was 80 experimental units. Observations were made for three months after treatment in the vegetative phase. Observation parameters included leaf shape, leaf color, plant height, number of leaves, leaf width, and length of stomata. This study indicated that the interaction between genotype and colchicine significantly differed in plant height and the number of leaves. Colchicine significantly increased the length of stomata, and genotype significantly affected all observed parameters. This study concluded that 0.05% colchicine significantly increased plant height (26.67%) and the number of leaves (48.98%) in the Gemilang genotype but decreased plant height and leaf number in other genotypes. This study suggests the need for observation of the flowering phase and fruit quality due to colchicine treatment.