PROSPECTS OF THE REMOTE HYBRIDIZATION ON IMPROVEMENT OF THE MAIN ECONOMICAL TRAITS OF COTTON GENOTYPES WITH NATURALLY COLORED FIBRE

Due to the insufficient quality of varieties with naturally colored fiber, their cultivation on a global scale is limited. For the first time in Azerbaijan, an attempt was made to investigate the possibility of improving the qualitative and economic traits in genotypes with brown fiber. For this, distant hybridization was carried out between tetraploid cultivars of the G. hirsutum L. (white fiber) and artificially obtained amphidiploids with a doubled set of chromosomes from the diploid specie G. arboreum L. (brown fiber), from the local Genbank. On this basis, during 2017-2019, distant hybrids with colored fiber and contrasting quality and productivity potential were studied in detail and identified. Qualitative traits such as micronair (Mic), strength (Str), and Uniformity Index (UI) were found to be comparable to the best parent with white fiber in hybrids with colored fibers, but the Upper Half Mean Length (UHML) still to be improved. The "number of bolls per plant" makes the maximum positive contribution to the total cotton yield. According to the results of the averaged data of two generations (F1 and F2), a change in the degree and direction of correlations between the studied characters, depending on the intensity of the fiber color, was noted.

Kapok Fiber- Structure, Characteristics and Applications: A Review

Kapok fiber is a light, cottony, pale yellow to brown fiber obtained from Kapok fruit. The fiber is characterized by a large, hollow lumen and is generally hydrophobic due to its waxy surface. The fiber is difficult to spun into thread and it is commonly used as filling in mattresses, pillows, stuffed toys and upholstery. Compared to other natural fiber, kapok’s use is limited in application. However, it is now gaining attention in the scientific community as an important material due to its outstanding properties. This review will provide a detailed overview on the structure, composition and morphology of kapok fiber. It will also discuss the recent researches conducted on kapok fiber including its application as adsorbent material, biocomposite, biotemplate, electrode material and others.

Comparative transcriptome analysis of leaves during early stages of chilling stress in two different chilling-tolerant brown-fiber cotton cultivars

Chilling stress generates significant inhibition of normal growth and development of cotton plants and lead to severe reduction of fiber quality and yield. Currently, little is known for the molecular mechanism of brown-fiber cotton (BFC) to respond to chilling stress. Herein, RNA-sequencing (RNA-seq)-based comparative analysis of leaves under 4°C treatment in two different-tolerant BFC cultivars, chilling-sensitive (CS) XC20 and chilling-tolerant (CT) Z1612, was performed to investigate the response mechanism. A total of 72650 unigenes were identified with eight commonly used databases. Venn diagram analysis identified 1194 differentially expressed genes (DEGs) with significant up-regulation in all comparison groups. Furthermore, enrichment analyses of COG and KEGG, as well as qRT-PCR validation, indicated that 279 genes were discovered as up-regulated DEGs (UDEGs) with constant significant increased expression in CT cultivar Z1612 groups at the dimensions of both each comparison group and treatment time, locating in the enriched pathways of signal transduction, protein and carbohydrate metabolism, and cell component. Moreover, the comprehensive analyses of gene expression, physiological index and intracellular metabolite detections, and ascorbate antioxidative metabolism measurement validated the functional contributions of these identified candidate genes and pathways to chilling stress. Together, this study for the first time report the candidate key genes and metabolic pathways responding to chilling stress in BFC, and provide the effective reference for understanding the regulatory mechanism of low temperature adaptation in cotton.

ANALYSIS OF SOME EMBRYOGENETIC TRAITS OF THE INTRASPECIFIC AND INTERSPECIFIC F1 HYBRID PLANTS G.HERBACEUM L. AND G.ARBOREUM L

In this article was given that number of anthers in intraspecific and interspecific F1 hybrid plants obtained from crossing intraspecific varieties of the species G.herbaceum L. and G.arboreum L. were observed that was intermediate (f.harga x subsp.africanum, subsp.obtusifolium x subsp.nanking) and strong negative (subsp.obtusifolium x subsp.perenne, f.harga x subsp.perenne) than the selection material were observed and the number of pollen grains in one anther in groups obtained with the involvement of ruderal and ruderal (subsp.pseudoarboreum x f.harga, f.harga x subsp.pseudoarboreum, f.harga x subsp.perenne, subsp.perenne x f.harga) and (subsp.nanking (brown fiber) x variety «VIR 1372, variety «VIR 1372 x subsp.nanking (brown fiber)) form with the positive heterosis. The obtained data have a kind of versatility and were defined to correspond to the data of literary sources. KEY WORDS: species, intraspecific, interspecific, variety, form, wild, ruderal, sympodial tropical, sympodial subtropical, flower, anther, pollen, pieces.

Evaluation of Productivity, Fiber Fineness, and Tolerance to Insect Pests of F7 Cotton Lines with Brown Fiber

<p>ABSTRACT<br />Coloured cotton has been used since 3400-2300 BC. Historically, it has been used prior to allotetraploid cotton which are now planted (G. hirsutum dan G. barbadense) of which some have brown and green fiber. The use of coloured cotton is environmentally friendly, and the demand for it will be increasing in relation with the increased demand of organic cotton. The research was aiming to evaluate of Productivity, Fiber Fineness, and Tolerance to Insect Pests ofF7 promising cotton lineswith brown fiber for the development of national cotton new varieties with brown fiber. The experiment was carried out at Pasirian Experimental Station at Lumajang on Januari-December 2013. 14 F7 lines resulted from 2006 crosses and two control varieties were tested in Randomised Blocked Design. There were two unit tests, the spray and unspray test, each was replicated three times. Plot size was 3 x 10m2 with plant spacing was made of 100 x 25 cm in which one single plant per hole was maintained. observation was done on growth and generative components, seed cotton yield, and field tolerance component. Experimental result showed that line 06063/5 was consistently shown high seed cotton yield under spray (2348,3 kg/ha) and unspray conditions (2372,8 kg/ha). Under unspray condition, there were four promising lines which were yielded higher that the best control varieties (Kanesia 10, 2197,2 kg/ha), i.e. 06063/5 (2372,80 kg/ha), 06067/3 (2235,0 kg/ha), 06062/3 (2255,60 kg/ha), and 06066/2 (2383,90 kg/ha). In addition, the best line showingthe highest field tolerance index was 06066/2 (110,5%). There were only two lines which had fiber length of ≥ 1 inch (25,4 mm), i.e. 06067/4 and 06062/1. It terms of fiber strength, genetic improvement achieved was ranging from 0,81 to 11,54% better than Kanesia 10, but 8,11 – 17,64% worse than Kanesia 8. Nine lines which had their fiber fineness 3,0 – 3,8 mic which are met the industry’s demand.<br />Keywords: Gossypium hirsutum L., coloured cotton, productivity, field tolerance index</p><p> </p><p>EVALUASI PRODUKTIVITAS, MUTU SERAT, DAN KETAHANAN TERHADAP HAMA GALUR-GALUR F7 KAPAS BE RSERAT COKLAT</p><p>ABSTRAK<br />Kapas dengan serat berwarna non-putih telah digunakan sejak tahun<br />3400-2300 sebelum Masehi. Sejarah perkembangannya diperkirakan lebih<br />awal dibandingkan kapas allotetraploid yang banyak dikembangkan saat<br />ini (G. hirsutum dan G. barbadense) yang beberapa memiliki warna serat coklat dan hijau. Penggunaan serat kapas berwarna sangat ramah lingkungan dan pemanfaatannya akan meningkat sejalan dengan meningkatnya permintaan kapas organik. Tujuan penelitian ini adalah untuk mengevaluasi produktivitas, mutu serat dan ketahanan terhadap hama galur-galur harapan F7 kapas dengan serat berwarna coklat dalam rangka mengembangkan varietas kapas nasional berserat coklat.Penelitian menguji 14 galur F7 hasil persilangan tahun 2006 dan dua varietas pembanding dilaksanakan di KP Pasirian, Lumajang pada bulan Januari- Desember 2013; disusun dalam Rancangan Acak Kelompok. Terdapat dua unit pengujian yaitu pengujian dengan pengendalian hama optimal (SPRAY atau S) dan pengujian tanpa pengendalian hama (TANPA SPRAY atau TS) masing-masing diulang tiga kali. Ukuran plot adalah 3 x 10m2; jarak tanam adalah 100 x 25 cm dan pada masing-masing lubang tanam dipelihara satu tanaman. Pengamatan komponen pertumbuhan dan hasil, hasil kapas berbiji, dan komponen ketahanan dilakukan untuk menilai penampilan galur. Hasil penelitian menunjukkan bahwa galur 06063/5 secara konsisten menunjukkan produksi kapas berbiji yang cukup tinggi baik dalam kondisi dengan pengendalian hama (2 348,3 kg/ha) maupun tanpa pengendalian hama (2372,8 kg/ha). Pada kondisi tanpa pengendalian hama, terdapat empat galur yang lebih unggul dibandingkan varietas pembanding terbaik (Kanesia 10, 2197,2 kg/ha) yaitu 06063/5 (2 372,80 kg/ha), 06067/3 (2 235,0 kg/ha), 06062/3 (2255,60 kg/ha), dan 06066/2 (2383,90 kg/ha). Selain itu, galur yang menunjukkan indeks ketahanan lapang terbaik adalah 06066/2 (110,5%). Hanya terdapat dua galur yang panjang seratnya ≥ 1 inchi (25,4 mm), yaitu 06067/4 dan 06062/1. Apabila dibandingkan Kanesia 10, diperoleh kemajuan dalam hal kekuatan serat sebesar 0,81-11,54%. Tetapi apabila dibandingkan dengan Kanesia 8, maka kekuatan serat dari galur-galur yang diuji lebih rendah 8,11 – 17,64%. Terdapat sembilan galur yang kehalusan seratnya dikelompokkan pada kategori diterima oleh industri (3,0 – 3,8 mic).<br />Kata kunci: Gossypium hirsutum L., kapas dengan serat berwarna, produktivitas, indeks ketahanan lapang.</p>