VARIABILITY OF MORPHO-BIOLOGICAL TRAITS UNDER THE INFLUENCE OF LOW-FREQUENCY ELECTROMAGNETIC FIELDS ON VEGETATIVE ORGANS OF COTTON

In this article presents the obtained data on research the effect of low-frequency electromagnetic fields on the vegetative organs of cotton in conditions of normal and insufficient water regime. On the basis of the obtained results was revealed that the treatment of the vegetative organs of cotton with EMF will accelerate the growth-development, ripeness and resistance to water deficiency. KEY WORDS: cotton, processing, vegetative organs, low-frequency electromagnetic fields, water supply, plant height, between nodes, cotton boll.

The quality of the cotton crop is determined by the physical, mechanical and technological properties of the fiber

In the course of the study, the biological characteristics of cotton, agrotechnical measures, soil and climatic conditions and technological factors that create conditions for the of a “fibrous coat”, “seed coat” and “seed crumbs” in the fiber were studied. The morphological characteristics of the varieties, the weight of the seed may differ depending on the soil-climatic and agrotechnical conditions, as well as the cultivation conditions. Key words: cotton, raw cotton, seed, technological features, variety, physical-mechanical features

Study of the effect of physical mutagens on the elements of cotton varieties Summary

The effect of different doses of gamma rays of the Co60 isotope on the seeds of cotton varieties AzNIXI-104 and AzNIXI-195 before sowing caused changes in the growing season, plant height, sympodial branches and the number of bolls on the bush. At low doses of gamma rays (500 r, 5000 r) the vegetation period was shortened, the number of sympodial branches and bolls in the branch increased, and at high doses of mutagen a decrease in biomorphological features was observed. Key words: cotton, sort, gamma ray, mutagen, sympodial branch, vegetation period.

IDENTIFIKASI DAN UJI KAPASITAS REPRODUKSI PARASITOID TELUR ULAT PENGGEREK BUAH MERAH JAMBU PADA TANAMAN KAPAS

<p>ABSTRAK<br />Pectinophora gossypiella merupakan salah satu hama utama<br />tanaman kapas yang menyerang dengan cara menggerek buah. Mulai<br />stadia larva kecil hingga pupa berada di dalam buah. Perilaku tersebut<br />menjadi salah satu sebab kurang efektifnya beberapa cara pengendalian P.<br />gossypiella dengan sasaran stadia larva. Untuk itu, peluang yang<br />diharapkan akan memberikan hasil pengendalian yang lebih baik adalah<br />sasaran pada stadia telur yaitu antara lain pemanfaatan parasitoid telur.<br />Dari hasil eksplorasi telah diperoleh parasitoid telur Trichogrammatidae<br />yang berasal dari pertanaman kapas di Lamongan dan Asembagus, Jawa<br />Timur. Penelitian ini bertujuan untuk mengidentifikasi spesies parasitoid<br />telur P. gossypiella dan kapasitas reproduksinya. Penelitian ini<br />dilaksanakan di Balai Penelitian Tanaman Tembakau dan Serat Malang<br />pada bulan Maret - Desember 2002. Hasil penelitian menunjukkan bahwa<br />parasitoid telur Trichogrammatidae yang muncul dari telur P. gossypiella<br />yang berasal dari kedua lokasi, berasal dari spesies yang sama dan berbeda<br />dengan spesies T. armigera yang memarasit telur H. armigera.<br />Berdasarkan kapasitas reproduksinya, Trichogrammatoidea bactrae N &amp; N<br />berpotensi sebagai agens hayati pengendali ulat penggerek buah kapas<br />merah jambu P. gossypiella.<br />Kata kunci : Kapas, Gossypium hirsutum, hama, Pectinophora<br />gossypiella, parasitoid telur, Trichogrammatidae, laju<br />pertumbuhan</p><p><br />ABSTRACT<br />Identification and reproduction capacity test of egg<br />parasitoid pink bollworm, Pectinophora gossypiella<br />Saunders on cotton<br />Pectinophora gossypiella is one of main pests of cotton. It attacks<br />the boll since small larvae until pupae and the insect is located in the boll.<br />This could be the reason why any control actions targeted to the larvae<br />were not effective. Therefore, the use of egg parasitoid to control the<br />bollworm population would be more promising. Exploration of the egg<br />parasitoid of the bollworm was done in Lamongan and Asembagus, East<br />Java. The parasitoids were considered as new locality report. This study<br />was to identify egg parasitoid of P. gossypiella and to study their<br />reproduction capacity. The study was conducted in Biological Control<br />Laboratory of IToFCRI Malang, March – December 2002. The study<br />included identification morphologically and biosystematically. The results<br />showed that Trichogrammatid emerged from P. gossypiella egg collected<br />from Asembagus (Trichogrammatoidea sp-A) and Lamongan (Trichogra-<br />mmatoidea sp-L) were the same species. Based on the reproduction<br />capacity of the parasitoids, Trichogrammatoidea bactrae N &amp; N were<br />potential as biological control agent for P. gossypiella.<br />Key words : Cotton, Gossypium hirsutum, pest, Pectinophora<br />gossypiella, egg parasitoid, Trichogrammatidae, intrinsic<br />rate</p>

PHYLOGENETIC RELATIONSHIPS OF AUSTRALIAN AND INDOCHINESE COTTON SPECIES

The article presents data on phylogenetic relationships of Australian and Indo-Chinese cotton species. A relatively close relationship of the wild species G.nelsonii with the subspecies G.arboreum is established. ssp. nanking when used as a maternal form during hybridization. It is noted that this wild species can be used as a valuable source material for breeding and genetic research in the creation of unique forms of cotton. KEY WORDS: cotton, species, interspecific crossing, comparative morphology, hybridization

A revised map of chromosome 16 in Gossypium hirsutum

Four translocations involving chromosome 16 (H16) in cotton (T1R;16R 2770, T1R;16R 4672, T15L;16R 8-5Ga, and T15R;16R 2767) were tested against telosomes for chromosome 16 and the H16 marker gene red plant (R1). The telosome tests confirmed that bp-2770 and bp-4672 are in the long (=right) arm of chromosome 16 and showed that bp-8-5Ga and bp-2767 are also in the long arm of H16, rather than in the short (=left) arm as previously reported. The locations of the chromosome 15 (H15) bp's for 8-5Ga and 2767 are also revised. A telosome test showed that H15 bp-8-5Ga is in the long (=left) arm. Consequently, H15 bp-2767 is placed in the short (=right) arm of chromosome 15. Duplication deficiencies mono- or tri-segmental for H16 (verified cytologically) showed that R1 is in the right (R) arm 24 cM distal to bp-2767 and 10 cM distal to bp-8-5Ga. Recombination frequencies showed that R1 is 13 cM from bp-4672 and 15 cM from bp-2770 (not significantly different). However, both of the T1R;16R translocations yield negligible frequencies of duplication deficiencies and therefore offered no direct evidence as to whether their breakpoints are proximal or distal to R1. Previous estimates have placed both bp-2770 and bp-4672 43 cM from the centromere. Therefore the order must be as follows: (left)–centromere–bp-2767-bp-8-5Ga–R1–bp-4672/bp-2770 (right). Key words: cotton, Gossypium hirsutum, chromosome 16, translocations, linkage map, duplication-deficiences, red plant, linkage group III.