EFFECT OF CULTIVAR AND SPRAYING WITH THE AMINO ACID PHENYLALANINE ON THE YIELD OF BLACK RICE GRAINS AND THEIR CONTENT OF SOME ANTHOCYANIN PIGMENTS

The two field experiments were conducted during the 2019 and 2020 agricultural seasons at the Najaf Research Department/Rice Research Station in Al-Mashkhab. In the first season, they were planted with Goura, Local and Chakhao rice cultivar (one plate for each cultivar) and by 100 plants per cultivar/ plot .The selection intensity of 10% was used to select plants with the highest total anthocyanin pigment content In order to study the effect of spraying the amino acid phenylalanine in improving the grain yield of black rice and its content of some anthocyanin pigments, it was planted in the second season with the origin cultivar under the influence of four levels of spraying the amino acid phenylalanine. The selected Goura genotype was significantly excelled by giving the highest averages in plant height, weight of 1000 grains and total grain yield, which were 118.47 cm, 23.44 g and 6.70 tons.ha-1, respectively. Whereas, the local selected genotype was significantly excelled by giving the highest averages in the leaves content of total chlorophyll pigments SPAD, total anthocyanins, Cyanidin 3-O-glucoside, Peonidin 3-O-glucoside, Cyanidin, Delphinidin, Peonidin and Malvidin, which amounted to 39.13 SPAD and 17.79% and 61.67%, 57.81, 29.92, 7.89, 5.82, 4.34, 1.40, 1.36, 61.17 mg.kg-1 dry weight, respectively. The spraying of the amino acid phenylalanine at a concentration of 50 mg.l-1 was significantly excelled by giving the highest averages in the indicators of vegetative growth and yield, its components and active compounds.