Biological aspects of Chines cabbage (Brassica pekinensis Rupr) seed production in the tropics / by Kasem Piluek

By: Material type: TextTextLanguage: English Publication details: Los Baños, Laguna : 1985. Cavite State University- Main Campus,Description: 175 pages : illustrations ; 28 cmContent type:
  • text
Media type:
  • unmediated
Carrier type:
  • volume
Subject(s): DDC classification:
  • 635.34  P64 1985
Online resources: Abstract: FILUEK KASEM, University of the Philippines at Los Banos, December 1985, Biological Aspects of Chinese Cabbage (Brassica pekinensis Rupr.) Seed Production in the Tropics. Major Professor: Dr. Ruben L. Villareal During the 1984 cool season, experiments on Chinese cabbage seed production of open--pollinated cultivars were conducted at two experiment stations in Chiangmai, Thailand. At Fang Horticulture Experimental Station which is of medium elevation (509 m), the effects of planting dates, varieties, nitrogen fertilizer, and plant growth regulators on seed yield and its components were studied. In the same period, experiments on seed production of F, hybrid using AVRDC inbreds E~9 and 0--2 were performed at Ang Khang Experimental Station, highland (1300 m), to study the optimal planting dates, flowering synchronization, degree of self- incompatibility, and methods in maintenance of the inbred lines. For open-pollinated seed production, planting on November 20 produced a significantly higher seed yield per plant and per plot than earlier plantings because of better growth during pre-anthesis and post -anthesis development, The cultivars 77M(2/3)-43 ana 774(02)-25 had high yielding ability; however, further varietal improvement for earlier flowering and uniform bolting is necessary. High incidence of soft rot at planting density of 66,700 plants per hectare, caused no significant difference in seed yield compared with 33,300 plants per hectare. Nitrogen at 50 kg/ha, split-thrice application, had significantly higher seed yield than the control. Spraying GA3 at 200 ppm two weeks after transplanting increased seed yield. In Fy hybrid seed production, the degree of self~incompatibility of an inbred was the same for both highland and medium elevation conditions. Planting on November 8 gave the highest yield of F, hybrid, but a decline was observed with the later transplanting. The inbred E-9 flowered earlier by 14 days, while deheading 0-2 advanced its flowering by 7 days; therefore, flowering synchronization could be better achieved by adjustment in planting dates of the parental inbreds of F1 from this experiment showed heterosis in vegetable yield. In maintenance and increases of inbred lines, seifing open-Plots gave less Seat set than bud-pollination due to mechanical injury of the stigma. To increase an inbred population, flower--sucker cuttings were successfully rooted by soaking in IAA at 100 ppm. Propagation through tissue culture of axillary buds in Murashige and Skoog's medium involved; shoot regeneration with 0.5 ppm BA + O ppm NAA as well as 0.5 ppm BA + 0.2 ppm NAA; shoot multiplication with 2.0 ppm BA + 0 ppm NAA as wéll as 2.0 ppm BA + 0.2 ppm NAA, root formation with 0.2 ppm BA + 0.2 ppm NAA as well as 0.5 ppm BA + 0.2 ppm NAA.
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Thesis (Ph.D--Horticulture) University of the Philippines

Includes bibliographical references.

FILUEK KASEM, University of the Philippines at Los Banos, December 1985, Biological Aspects of Chinese Cabbage (Brassica pekinensis Rupr.) Seed Production in the Tropics. Major Professor: Dr. Ruben L. Villareal

During the 1984 cool season, experiments on Chinese cabbage seed production of open--pollinated cultivars were conducted at two experiment stations in Chiangmai, Thailand. At Fang Horticulture Experimental Station which is of medium elevation (509 m), the effects of planting dates, varieties, nitrogen fertilizer, and plant growth regulators on seed yield and its components were studied. In the same period, experiments on seed production of F, hybrid using AVRDC inbreds E~9 and 0--2 were performed at Ang Khang Experimental Station, highland (1300 m), to study the optimal planting dates, flowering synchronization, degree of self-
incompatibility, and methods in maintenance of the inbred lines.

For open-pollinated seed production, planting on November 20 produced a significantly higher seed yield per plant and per plot than earlier plantings because of better growth during pre-anthesis and post -anthesis development, The cultivars 77M(2/3)-43 ana 774(02)-25 had high yielding ability; however, further varietal improvement for earlier flowering and uniform bolting is necessary. High incidence of soft rot at planting density of 66,700 plants per hectare, caused no significant difference in seed yield compared with 33,300 plants per hectare. Nitrogen at 50 kg/ha, split-thrice application, had significantly higher seed yield than the control. Spraying GA3 at 200 ppm two weeks after transplanting increased seed yield.

In Fy hybrid seed production, the degree of self~incompatibility of an inbred was the same for both highland and medium elevation conditions. Planting on November 8 gave the highest yield of F, hybrid, but a decline was observed with the later transplanting. The inbred E-9 flowered earlier by 14 days, while deheading 0-2 advanced its flowering by 7 days; therefore, flowering synchronization could be better achieved by adjustment in planting dates of the parental inbreds of F1 from this experiment showed heterosis in vegetable yield.

In maintenance and increases of inbred lines, seifing open-Plots gave less Seat set than bud-pollination due to mechanical injury of the stigma.

To increase an inbred population, flower--sucker cuttings were successfully rooted by soaking in IAA at 100 ppm. Propagation through tissue culture of axillary buds in Murashige and Skoog's medium involved; shoot regeneration with 0.5 ppm BA +
O ppm NAA as well as 0.5 ppm BA + 0.2 ppm NAA; shoot multiplication with 2.0 ppm BA + 0 ppm NAA as wéll as 2.0 ppm BA + 0.2 ppm NAA, root formation with 0.2 ppm BA + 0.2 ppm NAA as well as 0.5 ppm BA + 0.2 ppm NAA.


Submitted to the University Library 05/04/2007 T-1507

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