Analisis Kromosom Nanas (Ananas comosus var. comosus) dan Nanas Merah Liar (Ananas comosus var. bracteatus)
Penulis Utama
:
Raihan Nur Aziz
NIM / NIP
:
H0721128
×<p>Pineapple (Ananas comosus (L.) Merr.) is a tropical fruit plant from the Bromeliaceae family. Pineapple has high
heterozygosity even though it is cultivated vegetatively, so the unique characteristics of the Ananas species need to
be studied cytologically. The aim of this study were: (1) To obtain genetic information on the number, size, and shape
of chromosomes, as well as the chromosome arrangement of pineapple plants; (2) To determine the karyotype
pattern arrangement in pineapple plants; (3) Comparing chromosome structures between pineapple varieties to
reveal indications of phylogenetic relationships between varieties within a species. The method used was squashing.
This research was conducted at the Plant Breeding Laboratory, Faculty of Agriculture, UNS from December 2024 to
June 2025. The plant parts used as research materials were pineapple roots tip grown from crowns via water
propagation. Observation variables were number of chromosome, size of chromosome, shape of chromosome,
karyotype, and chromosomal asymmetry index. Each variety was studied using four replications, and data analysis
was conducted descriptively. The results showed that pineapple and red wild pineapple chromosomes have the same
number of chromosomes, namely 50 chromosomes (2n=50), with an average chromosome arm length of
0.895±0.211 µm for pineapple (var. comosus) and 0.723±0.126 µm for red wild pineapple (var. bracteatus). All
chromosomes were metacentric with a karyotype formula of 2n=2x=50=25m. The Intrachromosomal Asymmetry
Index (A1) and Interchromosomal Asymmetry Index (A2) showed small values, indicating that both species are
composed of metacentric chromosomes with minimal size variations.Pineapple (Ananas comosus (L.) Merr.) is a tropical fruit plant from the Bromeliaceae family. Pineapple has high
heterozygosity even though it is cultivated vegetatively, so the unique characteristics of the Ananas species need to
be studied cytologically. The aim of this study were: (1) To obtain genetic information on the number, size, and shape
of chromosomes, as well as the chromosome arrangement of pineapple plants; (2) To determine the karyotype
pattern arrangement in pineapple plants; (3) Comparing chromosome structures between pineapple varieties to
reveal indications of phylogenetic relationships between varieties within a species. The method used was squashing.
This research was conducted at the Plant Breeding Laboratory, Faculty of Agriculture, UNS from December 2024 to
June 2025. The plant parts used as research materials were pineapple roots tip grown from crowns via water
propagation. Observation variables were number of chromosome, size of chromosome, shape of chromosome,
karyotype, and chromosomal asymmetry index. Each variety was studied using four replications, and data analysis
was conducted descriptively. The results showed that pineapple and red wild pineapple chromosomes have the same
number of chromosomes, namely 50 chromosomes (2n=50), with an average chromosome arm length of
0.895±0.211 µm for pineapple (var. comosus) and 0.723±0.126 µm for red wild pineapple (var. bracteatus). All
chromosomes were metacentric with a karyotype formula of 2n=2x=50=25m. The Intrachromosomal Asymmetry
Index (A1) and Interchromosomal Asymmetry Index (A2) showed small values, indicating that both species are
composed of metacentric chromosomes with minimal size variations.</p><p>Keywords: Bromeliaceae; cytology; karyotype; root tip; squash method.</p>
×
Penulis Utama
:
Raihan Nur Aziz
Penulis Tambahan
:
-
NIM / NIP
:
H0721128
Tahun
:
2025
Judul
:
Analisis Kromosom Nanas (Ananas comosus var. comosus) dan Nanas Merah Liar (Ananas comosus var. bracteatus)
