Nursery performance of full and half-sib progenies and juvenile screening for selection in rubber (Hevea brasiliensis Muell. Arg.) breeding

Chandrasekhar T. R., . and Giresh T., . Nursery performance of full and half-sib progenies and juvenile screening for selection in rubber (Hevea brasiliensis Muell. Arg.) breeding. pp. 200-214. ISSN 1511-1768

In order to report growth and yield performance of progenies of 2002-hand pollination programme and to discuss the observations vis- -vis juvenile screening in Hevea breeding test tapping at three years was carried out. Latex volume instead of dry rubber was collected as yield from each tapping. Dry rubber content (DRC) of top selections was determined for calculation of rubber yield. Distribution of seedlings in different girth yield and DRC classes were studied. Mean range in latex yield noted in the full-sib progenies of Wickham Wild accessions was 0.1 to 4.5 mL t“1 t“1 (mL per tree per tapping) while in Wickham Wickham progenies it was 0.1 to 19.6 mL t“1 t“1. In the clonal half-sibs (HS) mean yield was low in HS progenies of RRII 105 and PB 330 while in RRII 414 and RRII 429 it was higher. Maximum latex yield noted from a tapping was 33.0 mL t“1 t“1. Dry rubber yield in the top 20 selections showed a range of 0.7 to 4.1 g t“1 t“1 (grams per tree per tapping). Mean yield from 10 tappings ranged from 7 to 41 g t“1 10t“1 (grams per tree per 10 tappings). DRC among the top 20 selections varied from 14.3 to 38. In the low girth class only one was included in the top 20 of selections. Moderate and average girth classes each contributed 41 and 38 seedlings that included most of the top 20 of selections. It was concluded that test-tapping at age three rather than at two was more useful. Measurement of yield in terms of latex volume as opposed to that of dry rubber yield can result in more accurate yield recording. Latex can be used for determining rubber content and biochemical and physiological determinants of yield that can further boost the probability of potential selections. For maximum genetic gain in juvenile selection seedlings of moderate to high girth class and average yield seemed more promising.

Full text available from: Official URL: http://vitaldoc.lgm.gov.my:8060/vital/access/servi...

Abstract

In order to report growth and yield performance of progenies of 2002-hand pollination programme and to discuss the observations vis- -vis juvenile screening in Hevea breeding test tapping at three years was carried out. Latex volume instead of dry rubber was collected as yield from each tapping. Dry rubber content (DRC) of top selections was determined for calculation of rubber yield. Distribution of seedlings in different girth yield and DRC classes were studied. Mean range in latex yield noted in the full-sib progenies of Wickham Wild accessions was 0.1 to 4.5 mL t“1 t“1 (mL per tree per tapping) while in Wickham Wickham progenies it was 0.1 to 19.6 mL t“1 t“1. In the clonal half-sibs (HS) mean yield was low in HS progenies of RRII 105 and PB 330 while in RRII 414 and RRII 429 it was higher. Maximum latex yield noted from a tapping was 33.0 mL t“1 t“1. Dry rubber yield in the top 20 selections showed a range of 0.7 to 4.1 g t“1 t“1 (grams per tree per tapping). Mean yield from 10 tappings ranged from 7 to 41 g t“1 10t“1 (grams per tree per 10 tappings). DRC among the top 20 selections varied from 14.3 to 38. In the low girth class only one was included in the top 20 of selections. Moderate and average girth classes each contributed 41 and 38 seedlings that included most of the top 20 of selections. It was concluded that test-tapping at age three rather than at two was more useful. Measurement of yield in terms of latex volume as opposed to that of dry rubber yield can result in more accurate yield recording. Latex can be used for determining rubber content and biochemical and physiological determinants of yield that can further boost the probability of potential selections. For maximum genetic gain in juvenile selection seedlings of moderate to high girth class and average yield seemed more promising.

[error in script]

Item Type:	Article
AGROVOC Term:	Tapping
AGROVOC Term:	Seedlings
AGROVOC Term:	Nursery plants
AGROVOC Term:	Juvenile forms in plants
AGROVOC Term:	Hevea brasiliensis
AGROVOC Term:	Yields
AGROVOC Term:	Pollination
AGROVOC Term:	Weather conditions
AGROVOC Term:	Growth rate
AGROVOC Term:	Genetic gain
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	24 Apr 2025 06:28
URI:	http://webagris.upm.edu.my/id/eprint/23053

Actions (login required)

View Item