สืบค้นงานวิจัย
Phloic Rays in Hevea brasiliensis with Reference to Tapping Panel Dryness and Yield Stimulation
Vinoth Thomas - ไม่ระบุหน่วยงาน
ชื่อเรื่อง (EN): Phloic Rays in Hevea brasiliensis with Reference to Tapping Panel Dryness and Yield Stimulation
ผู้แต่ง / หัวหน้าโครงการ (EN): Vinoth Thomas
บทคัดย่อ (EN): Hevea brasiliensis, the prime source of natural rubber, is collected by tapping the bark on the tree trunk. High yielding clones of Hevea when tapped intensively showed the symptoms of the cessation of latex flow gradually from the tapping panel called Tapping panel dryness (TPD), leading to a number of anatomical deformations in the bark which includes altered cambial activity, heavy deposition of definitive callose and p-protein in the sieve tubes, high tannin accumulation, sclereid formation etc. The unproductive bark in the TPD trees when treated with 5% ethephon started to yield latex for a short period of time, Latex biosynthesis needs high input of photoassimilate which routed downwardly through the sieve tube is being blocked by the heavy deposition of definitive callose and p-protein in TPD trees. The study was initiated to trace the structural modifications occurred in the phloic rays as an alternative route for translocation under necessity. Phloic rays, the main route for radial translocation of photoassimilates in the bark of Hevea have a non-storied alignment of oval to elongated or dumb-bell shaped multiseriate ray with 1-4 uniseriate isodiametric terminal cells on either ends of the ray. The dimensions of phloic ray differ significantly in the bark of healthy, TPD affected and stimulated trees. A decrease in length and an increase in width of phloic rays were evident in TPD affected trees over healthy trees. Average height of the ray (um) in the bark of healthy, TPD affected, unaffected area above the TPD affected area and TPD panel applied with ethephon was 495,259,416 and 285 respectively, Ray height of 1000 µm (3.4%) was found in healthy trees while in TPD trees maximum ray height was noted to be 500 µm (1.9%). In healthy trees, 57% of the rays fall in the stratified height class of 300-500 µm but in TPD trees, 78% of the phloic rays is having a height less than 300 µm. The average width of the ray measured 56.81 and 74.25 µm respectively for healthy and TPD Trees. In healthy tress 61% of the ray falls under the width strata of 40-60 µm and in TPD trees 68% is in the 60-80 and 24% in the 80-100 µm width strata. Transformative division of the fusiform initials of cambium give rise to ray cells leads to an increase in its density. Which was more pronounced in the TPD affected and stimulated bark over healthy bark. The phloic rays thus formed had an outline without uniformity in cell size of shape. In TPD affected and stimulated trees, many of the axial parenchyma cells took part in conduction either by modified as protein storing cells or enlarged to form a uniseriate arrangement that exist among the bark tissue independently or in adherence with the phloic rays to make it wider. Histochemical evidences revealed that after stimulation, starch deposition from the wood beneath the affected panel was completely mobilized from the respective tissue. For the production of latex from the unproductive bark of the TPD tree on stimulation, adequate quantity of nourishments is being mobilized to the site of action by strengthening the radial transport system in the affected area is discussed.
บทคัดย่อ: ไม่พบข้อมูลจากหน่วยงานต้นทาง
ภาษา (EN): en
เผยแพร่โดย (EN): การยางแห่งประเทศไทย
คำสำคัญ (EN): ethephon
เจ้าของลิขสิทธิ์ (EN): การยางแห่งประเทศไทย
หากไม่พบเอกสารฉบับเต็ม (Full Text) โปรดติดต่อหน่วยงานเจ้าของข้อมูล

การอ้างอิง

Vinoth Thomas. "Phloic Rays in Hevea brasiliensis with Reference to Tapping Panel Dryness and Yield Stimulation". ไม่ระบุหน่วยงาน. ม.ป.ป.

Vinoth Thomas. "Phloic Rays in Hevea brasiliensis with Reference to Tapping Panel Dryness and Yield Stimulation". ไม่ระบุหน่วยงาน. ม.ป.ป.. Print.



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Phloic Rays in Hevea brasiliensis with Reference to Tapping Panel Dryness and Yield Stimulation
Vinoth Thomas
การยางแห่งประเทศไทย
ไม่ระบุวันที่เผยแพร่
Inheritance of Tapping Panel Dryness (TPD) in a Full-Sib Population of Hevea brasiliensis CLONAL VARIABILITY IN THE INCLINATION OF LATICIFERS AND PHLOIC RAYS IN HEVEA BRASILIENSIS Association of a Viroid with Tapping Panel Dryness of Hevea brasiliensis and its Molecular Characterization Sieve Tube Characteristics in Healthy and TPD Affected Trees of Hevea brasiliensis The dynamic system that exists in the sieve tubes of TPD affected trees of Hevea brasiliensis Rubber Particles Proteins and Sensitivity to the Tapping Panel Dryness at Hevea brasiliensis THE SITUATION OF TAPPING PANEL DRYNESS IN UPPER NORTHEAST OF THAILAND THE YIELD AND QUALITY OF RUBBER (HEVEA BRASILIENSIS) AS AFFECTED BY IRRIGATION AND FERTILIZER APPLICATIONS Influence of age and girth at opening on rubber yield, biochemical and tapping panel dryness parameters of Hevea brasiliensis in determining tapping norms Effect of Panel Changing on Long Term Yield Response of Hevea brasiliensis (clone RRII 105) under Different Frequencies of Tapping and Stimulation
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