TY - JOUR AU - Dewi, Kumala AU - Agustina, Rizkika Zakka AU - Nurmalika, Farida PY - 2017/01/06 Y2 - 2024/03/28 TI - EFFECTS OF BLUE LIGHT AND PACLOBUTRAZOL ON SEED GERMINATION, VEGETATIVE GROWTH AND YIELD OF BLACK RICE (Oryza sativa L. 'Cempo Ireng') JF - BIOTROPIA JA - BIOTROPIA VL - 23 IS - 2 SE - Research Paper DO - 10.11598/btb.2016.23.2.478 UR - https://journal.biotrop.org/index.php/biotropia/article/view/478 SP - 85-96 AB - <p><span lang="IN">Black rice (<em>Oryza sativa</em> L. 'Cempo Ireng'</span><span lang="IN">) is one of local rice varieties in Sleman Regency, Yogyakarta. The black color is </span>caused by<span lang="IN"> high anthocyanin content which is important source of antioxidant. The cultivation of black rice is still limited due to its </span>tall phenotype, long <span lang="IN">vegetative stage</span> and low productivitycompared to white rice. Paclobutrazol is a growth retardant causing dwarfing in several crop plants and reducing lodging. Blue light can improve plant quality. <span lang="IN">This research was aimed to evaluate the effect of blu</span>e<span lang="IN"> light and paclobutrazol on </span>seed germination, <span lang="IN">vegetative growth </span>and yield <span lang="IN">of black rice. The results showed that </span>the <span lang="IN">average of seed germination as well as</span> the<span lang="IN"> activity of α-amylase of seeds subjected to blue light </span>were<span lang="IN"> lower compared to those </span>subjected to<span lang="IN"> sunlight</span>;<span lang="IN"> however, paclobutrazol</span> concentrations<span lang="IN"> did not affect seed germination percentage. The height of rice plants treated with paclobutrazol decreased </span>in accordance with the increase of <span lang="IN">paclobutrazol concentration</span>. C<span lang="IN">hlorophyll content and tiller number</span>s<span lang="IN"> increased by paclobutrazol treatmen</span>t of 12.5 ppm<span lang="IN">. Nitrate reductase activity was higher in rice seedlings subjected to blue light compared to those</span> subjected to<span lang="IN"> sunlight. </span>Iron (Fe) <span lang="IN">content of rice plant</span>s<span lang="IN"> treated with</span> 25 or 50 ppm<span lang="IN"> paclobutrazol </span>increased <span lang="IN">compared to control. It was concluded that </span><span lang="IN">paclobutrazol application </span>of 12.5 ppm already <span lang="IN">reduced plant height</span>. The higher concentration of paclobutrazol applied the greater reduction on plant height was observed. Blue light treatment applied during black rice seed germination slightly reduced germination percentage and α-amylase activity in the germinated seeds. However, blue light treatment combined with paclobutrazol application during black rice seed germination<span lang="IN"> increased chlorophyll content</span>,<span lang="IN"> tiller number</span>s<span lang="IN"> and Fe content in black rice</span> grain.</p> ER -