Abstract. Anisa WN, Afifah EN, Murti RH. 2022. Selection of tomato breeding lines based on morphological traits associated with high yield potential in double-cross population. Biodiversitas 23: 2973-2980. Low tomato production is a global problem. Plant breeding has been intensified to develop high-yield varieties and meet the high production of vegetable crops. Selection is an essential part of plant breeding to evaluate desirable traits of breeding lines. This study aimed to identify tomato breeding lines with high yield potential from 13 breeding lines and 2 commercial tomatoes. Collected data were analyzed using analysis of variance, post hoc, path, and principal component analysis. Results showed that 9 tomato lines, namely, BV-1, BV-2, BV-3, BV-6, BV-7, BV-9, BV-11, BV-12, and BV-13 had a high yield potential based on the number of fruits per plant and fruit weight. Given their high path coefficient value and significant correlation (P<0.05) with the yield potential, these two characteristics are highly recommended to be used as selection criteria for the high yield potential of tomato plants. The following characteristics had a high value of heritability: fruit weight, fruit length, fruit diameter, fruit firmness, fruit locules, fruit pericarp thickness, total soluble solid, number of flowers per bunch, number of fruits per bunch, number of fruits per plant, and harvesting age.

Abstract. Khairi A, Murti RH, Irwan SNR, Putra ETS. 2023. Physicochemical properties in NOR tomato line MA 131-6-3 after treated with ethephon and calcium carbide induced ripening. Biodiversitas 24: 3029-3037. Tomato fruit Postharvest Losses (PHL) from rotting, Physiological Weight Loss (PWL), inadequate nutrition, and other factors can lower fruit quality. Tomato is included as climacteric fruit which shows a significant increase in respiration and ethylene. The use of tomato with an extended shelf life due to genetic engineering, such as a Non-Ripening (NOR) tomato, can lower PHL. This experiment was carried out to evaluate physicochemical characteristics of NOR tomato fruit (lineMA 131-6-3 as result of selection F6)during postharvest after being treated by Ethephon (ET) (375, 750, 1,125, and 1,500 ppm), calcium carbide (CaC2) (5, 10, 15, and 20 gkg?1), and control. The experimental design was arranged in Randomized Completely Block Design with three replications.The ambient temperature was 28.30±1.75°C and relative humidity of 60.69±2.33%. The results showed the fruit ripening and physicochemical altered with CaC2 treatment, then followed by yellow but did not alter to the red color for all treatments. The value of reduction sugar, respiration, ethylene, PWL, and pH increased, meanwhile the fruit firmness decreased caused by CaC2. Furthermore, ET could increase rotting during storage.