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TRANSCRIPT
COMPARATIVE STUDY OF CROSS BREED FROM PURE BREEDUSING PAINTED PONY AND STRING BEAN VARIETIES OF COMMON
BEAN (PHASEOLUS VULGARIS) AS GROWN IN BACKYARD GARDENING
DANILO V. ROGAYAN JR.
Presented to:
Dr. MA. ESTER DELA ROSA-MARIÑASCollege of Agriculture and Veterinary Medicine
RAMON MAGSAYSAY TECHNOLOGICAL UNIVERSITYSan Marcelino, Zambales
in Partial Fulfillment of the Requirements for
MAJOR 8 (Genetics)
JANUARY 2011
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INTRODUCTION
Common bean scientifically known as Phaseolus vulgaris, is an herbaceous
annual plant and now grown worldwide for its edible bean, popular both dry and as a
green bean. The leaf is occasionally used as a leaf vegetable, and the straw is used for
fodder. Botanically, the common bean is classified as a dicotyledon. Beans are a
legume and thus acquire their nitrogen through an association with rhizobia, a species
of nitrogen-fixing bacteria.
Common bean is a species widely cultivated due to its good nutritional
composition with high protein content in dry seed and a good source of fiber in snap
bean and its high market value. Consumers have progressively shown specific
preferences for various combinations of size and shape of bean seeds and pods, and
the market reflects this trend by giving preference to types of good quality rather than
high yield.
Plant cross-breeding uses deliberate interbreeding of closely or distantly related
individuals to produce new crop varieties or lines with desirable properties. Plants are
crossbred to introduce traits or genes from one variety or line into a new genetic
background. Progeny from the cross would then be crossed with the high-yielding
parent to ensure that the progeny were most like the high-yielding parent,
(backcrossing). Plants may also be crossed with themselves to produce inbred varieties
for breeding.
Plant cross-breeding relies largely on homologous recombination between
chromosomes to generate genetic diversity. Plant cross-breeding is being done to come
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up with varieties of plants that have: (a) increased quality and yield of the crop; (b)
increased tolerance of environmental pressures (salinity, extreme temperature,
drought); (c) resistance to viruses, fungi and bacteria; (d) increased tolerance to insect
pests; and (e) increased tolerance of herbicides.
The increasing concern on agricultural sustainability favors the maintenance of
plant cross-breeding systems which give efficient soil conservation due to the increased
ground cover that it provides, and a more stable agricultural production than sole crop,
for small farms, where capital is limited and labor is available.
This study seeks to distinguish the characteristics of the pure breed and cross
breed common bean using the varieties of beans – the string beans and painted pony
beans as grown in backyard gardening by the Bachelor of Secondary Education –
Biological Science major third year students of Ramon Magsaysay Technological
University – San Marcelino Campus.
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METHODOLGY
Common Bean (Phaseolus vulgaris) is an important legume grown worldwide for
its high nutritional and economic value. In some countries, it is the primary source of
protein in the human diet. In addition, bean consumption is increasing based on
perceived health benefits associated with certain vitamin and mineral contents.
Selection of Samples for the Cross-breeding. The experiment started with the
selection of bean varieties to be used as samples for the study and we came up using
the string bean and painted pony bean.
Painted pony bean is an heirloom that is a multi-purpose bean. It can be picked
in the early stages for a snap bean or left a few more weeks until mature and used for a
shell bean. It is a dual-purpose bean that produces delicious green beans and dried
beans, which have a beautiful white on brown coloration that is retained when cooked.
A rich and nutty flavor and perfect for any of your slow-cooked dishes.
Meanwhile, string bean is harvested as snap (bush) or green (pole or climbers)
beans. It is non-climbing plants while pole beans are staked, trained, and or with trellis.
Root rot organisms and bacterial diseases often build-up in soil when snap beans are
planted repeatedly in the same field. It has been bred especially for the fleshiness,
flavor, or sweetness of its pods.
Painted pony beans and string beans are chosen because they (a) easily grow;
(b) can live in any soil type; (c) can live in any climate; and (d) easily produce flowers
which are needed for the study.
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Preparation of Plots. After the selection of samples to be used in the study, the
group worked on the preparation of the plots for about two days which started
December 13, 2010.
Plots are prepared at the back area of the Agri-Vet Building. The preparation
involves weeding, cultivation of the soil, watering of the soil and fencing.
Planting the Seeds. After preparing the plots, planting of the seeds followed.
The varieties of the common beans used in the plots are the painted pony beans and
the string beans. The seeds were planted alternately with eight rows containing four
planting holes with a distance of 30 cm. Each of the hole had about 3-4 bean seeds.
Watering of the seeds after planting was also done.
Application of Vermicast. To ensure the fertility of the soil, vermicast extracted
from the previous vermiculture project of the group, was applied in the plots containing
the common bean seeds.
Watering and Cultivation of the Plots. As part of the monitoring activity, the
garden which contains the seeds was being watered regularly. In addition, cultivation of
the garden soil was also being done.
Weeding. After a week, the sprouts of the beans were noted. The seed samples
were germinated. Because of the sprouting, weeding around the plots were done to
prevent weeds from competing with the beans in absorbing nutrients from the soil.
Putting up of Trellis. After two weeks, the beans started to cling that’s why the
group prepared trellis for the growing vines.
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Insect Pests Elimination. As the beans continue to grow, insect pests also
continue to infect the beans. That’s why these pests which include black bean aphids
and black ants were being monitored and removed regularly through hand pick method.
Plant cross-breeding. After almost a month, flowers of the beans were
developed. These flowers were used in the cross-pollination or cross-breeding through
the use of hand pollination. The pollen grains of the painted pony bean were transferred
in the pollen grains of the string beans and vice versa.
As of this time, the results of the cross-breeding is still pending.
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DOCUMENTATION
Preparation of Plots. Plots are being prepared for the conduct of the study.
Planting the Seeds. Been seeds are being planted in the plots.
Application of Vermicast. Vermicast are being applied in each holes where bean seeds are planted.
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DOCUMENTATION
Cultivation of the Soil. Soil is being cultivated to ensure fertility.
Watering of the Plots. Regular watering is being done for fast growth of the seeds.
Weeding. Weeding is also done regularly to prevent weeds from competing nutrients from the plants.
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DOCUMENTATION
Putting up of Trellis. Trellis are being established to serve as support of the growing vines.
Bean aphids and black ants in the bean plants.
Insect Pests Elimination. Insect pests are being removed in the plants through hand pick method.
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