สืบค้นงานวิจัย
Inheritance of Tapping Panel Dryness (TPD) in a Full-Sib Population of Hevea brasiliensis
Narayanan C. - ไม่ระบุหน่วยงาน
ชื่อเรื่อง (EN): Inheritance of Tapping Panel Dryness (TPD) in a Full-Sib Population of Hevea brasiliensis
ผู้แต่ง / หัวหน้าโครงการ (EN): Narayanan C.
บทคัดย่อ (EN): Hevea brasiliensis (Willd. ex A. Juss.) Müll. Arg. (family, Euphorbiaceae; diploid, 2n=36), the Para rubber tree, is monoecious, entomophilic and predominantly out-crossing. Laticifer cells in the bark tissue of the tree are the source of natural rubber in the entire plant kingdom. TPD (Tapping Panel Dryness) is a symptom expressed by the tree when latex is not exuded from excised laticifer cells which in turn causes significant losses in yield in almost every rubber plantation. There are several theories about the causes of TPD but no single convincing cause has been found. Nevertheless, it is generally observed that trees which yield precocious amount of latex may ultimately show high incidence of TPD, and the symptom of TPD may be reversible or permanent. It has also been observed that a tapping rest sometimes result in alleviation of TPD symptoms. Numerous studies have already been done on TPD, however, from breeding and yield-improvement point of view, we still need more information on TPD causing factors and ways to address this important problem affecting yield. In order to achieve appreciable level of genetic gain through breeding, it is also important to know heritability of TPD among various clones. This information would be a decisive factor in Hevea breeding. Earlier studies have indicated high broad sense heritability for TPD among clones. The experimental population consisted of 11 separate families of full-sib progenies (hybridization involving 25 parental clones) and their parent clones, planted in 1993 in a small scale trial at Central Experimental Station, Chethackal (Pathanamthitta Dt., Kerala), following a replicated simple lattice design (5x5 design, four replicates, seven trees per replication). For the present study, observation was taken on all the trees on the occurrence of TPD during 2011 and 2012. The symptom of TPD was confirmed through tapping for two consecutive years. Based on data from all the replicate trees of full-sibs and their parent clones, narrow sense heritability of TPD was estimated based on parent-offspring regression. The regression was computed based on standard biometrical techniques using regression of off-spring on parent, covariance of off-spring on parents and variance of parents. For regression analysis, the mean values of parents and that of progenies were subjected to regression in which the sloping line indicates the linear regression of offspring on midparent. The slope of the line provides a direct estimation of narrow sense heritability (h2) for the particular trait. There was considerable variation for TPD in the population. In the parental clones, occurrence of TPD exhibited significant variation ranging from 3.6% in PB 5/51 to 46.4 % in PB 235. Clone RRII 33 did not show any incidence of TPD. Among full-sibs, progenies of combination PB 5/51 x RRII 208 showed minimum TPD occurrence (3.6%) while progenies of RRIM 600 x PB 235 showed maximum incidence (29.6%). Progenies of cross combination RRIM 600 x RRII 33 were devoid of any TPD symptoms. Overall, results from the above study suggested that progenies generated by cross between a non-TPD clone like RRII 33 may result in progenies with less TPD incidences. Also, the study suggested that progenies generated through hybridization between a high-TPD clones like PB 235 may possess tendency to have more TPD incidence. Although the above study indicates that TPD may be governed by heritable gene action, which could imply possible genetic gain through breeding for TPD tolerance, more such progeny data would be required for conformation.
บทคัดย่อ: ไม่พบข้อมูลจากหน่วยงานต้นทาง
ภาษา (EN): en
เผยแพร่โดย (EN): การยางแห่งประเทศไทย
คำสำคัญ (EN): latex
เจ้าของลิขสิทธิ์ (EN): การยางแห่งประเทศไทย
หากไม่พบเอกสารฉบับเต็ม (Full Text) โปรดติดต่อหน่วยงานเจ้าของข้อมูล

การอ้างอิง

Narayanan C.. "Inheritance of Tapping Panel Dryness (TPD) in a Full-Sib Population of Hevea brasiliensis". ไม่ระบุหน่วยงาน. ม.ป.ป.

Narayanan C.. "Inheritance of Tapping Panel Dryness (TPD) in a Full-Sib Population of Hevea brasiliensis". ไม่ระบุหน่วยงาน. ม.ป.ป.. Print.



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Inheritance of Tapping Panel Dryness (TPD) in a Full-Sib Population of Hevea brasiliensis
Narayanan C.
การยางแห่งประเทศไทย
ไม่ระบุวันที่เผยแพร่
Rubber Particles Proteins and Sensitivity to the Tapping Panel Dryness at Hevea brasiliensis Association of a Viroid with Tapping Panel Dryness of Hevea brasiliensis and its Molecular Characterization Phloic Rays in Hevea brasiliensis with Reference to Tapping Panel Dryness and Yield Stimulation Transcriptome Analyses Reveal Molecular Mechanism Underlying Tapping Panel Dryness of Rubber Tree (Hevea brasiliensis) Sieve Tube Characteristics in Healthy and TPD Affected Trees of Hevea brasiliensis cDNA-AFLP ANALYSIS REVEAIS DIFFERENTIAL GENE EXPRESSION IN BPM 24 CLONE OF HEVEA BRASILIENSIS EXHIBITING TAPPING PANEL DRYNESS (TPD) The dynamic system that exists in the sieve tubes of TPD affected trees of Hevea brasiliensis Effects of drought and tapping for latex production on water relations of Hevea brasiliensis trees MicroRNAs: New Regulators of Biological Functions in Hevea brasiliensis Promising latex timber clones of Hevea brasiliensis evolved by ortet selection
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