Juvenile and Mature Performances of Handpollinated Rubber Progenies and the Implication in Hevea Breeding
The RRIM's 1988 Hand-Pollination Programme was conducted using two different sources of materials. e.i. Wickham and Amazon. The progenies obtained from the Hand-Pollination Programme were used to establish a Seedling Evaluation Trial at RRIM Experiment Station, Sungai Buloh. Test tapping wa...
Saved in:
| Main Author: | |
|---|---|
| Format: | Thesis |
| Language: | English English |
| Published: |
1998
|
| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/10415/1/FP_1998_5_A.pdf |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | The RRIM's 1988 Hand-Pollination Programme was conducted using
two different sources of materials. e.i. Wickham and Amazon. The progenies
obtained from the Hand-Pollination Programme were used to establish a
Seedling Evaluation Trial at RRIM Experiment Station, Sungai Buloh. Test
tapping was carried out at three and half years after planting. The trial was
opened for normal tapping at seven years old. The p erformances of progenies
using data both at immature and mature stages were studied.
Generally. progenies from W x Am crosses were inferior to that of W x
W crosses in latex yield. However. there was a W x Am family (PB 5/51 x
64/151) and produced high yield in normal tapping that was comparable to the
best of W x W families. High correlation (r = 0. 972) was found between the two test tapping yield characters (mean yield over three cycles and five cycles
of tapping). The correlation between normal tapping yield and the two test
tapping yields were significant but lower (r = 0.660 and 0.715, respectively).
The family ranking order based on yield of normal tapping in comparison with
that on yield of test tapping was not very much different except for few cases.
There were families that produced better yield at normal tapping than in test
tapping and vice versa. Selection for top 10% yield of test tapping can get only
about half of expected individuals in the same proportion selected on yield at
normal tapping. |
|---|