EVALUASI KETAHANAN TANAMAN JERUK (Citrus sp.) HASIL FUSI PROTOPLAS JERUK SATSUMA MANDARIN (Citrus unshiu) DAN JERUK SIAM MADU (Citrus nobilis) TERHADAP INFEKSI PENYAKIT KULIT DIPLODIA (Botryodiplodia theobromae Pat.)

Abstract

ABSTRACT
Protoplast fusion mandarin satsuma orange and honey thai orange to increase the
quality of the honey thai orange into a seedless. Character of orange as product of
protoplast fusion has not been known include resistance against pest and disease.
One important disease of citrus is skin disease of diplodia that cause loosing yield.
Protoplast fusion has highly genetic variability that cause many probabilities of
resistance expression can be happened on infection of skin disease of diplodia on
orange as product of protoplast fusion. Research was conducted at glass house of
BALITJESTRO and Phytopathology Laboratory, Department of Plant Protection,
Faculty of Agriculture, University of Brawijaya. The purpose of this research was
to evaluation of resistance of orange as product of protoplast fusion and its
parental on infection of skin disease of diplodia by incubation period and infection
symptom area. Result of this research were known that there were 26 oranges as
product of protoplast fusion had different resistance level compared by its parental
in incubation period; there were 16 oranges as product of protoplast fusion had
different resistance level compared by its parental in infection symptom area and
there were 11 oranges as product of protoplast fusion had not different resistance
level compared by its parental in infection symptom area; Classification of the
resistance level of oranges as product of protoplast fusion were obtained 8 plants
were classified resistant, 17 plants were classified moderate, 5 plants were
classified susceptible.
Keywords: Plant endurance, Protoplast fusion, Citrus unshiu, Citrus nobilis,
Botryodiplodia theobromae Pat.