University Of Agricultural Sciences, Bangalore

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Dr. M. Byre Gowda
Pigeonpea & Dolichos Breeder
University of Agricultural Sciences
GKVK, Bangalore - 560 065
India
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+91 80 22736043
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+91 9741414657
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+91-80-23330277
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Supporting research & education in the biological sciences.

The Kirkhouse Trust was set up in September 2000. It is a small Scottish charity (No. SC 030508), funded by gift aid donations from Oxford Gene Technology IP Ltd, a UK company founded by Professor Sir Ed Southern. more...

Dolichos Bean - Lablab purpureus (L.) Sweet

Crop Production > Physiology

Physiology

Flower shedding is a major constraint for yield in this crop. In general about 10-20% of the flowers only develop into mature pods. However, it is reported that with proper management of the crop by applying 20 kg/ N/ha, at flowering, the flower drop can be minimized. Further, application of calcium chloride (0.1%) + NAA (100 PPM) when the flowers begin to open in the first inflorescence is reported to improve fruit–set and consequently yield.


Sheriff et al., (1967): Pod setting studies in Dolichos Lablab L.

By intensive plant breeding methods carried out at the Pulse Section, Agricultural College, Coimbatore, four promising varieties of Avarai (D. Lablab), DL. 250, DL. 269, DL. 453 and DL. 692 were released for general cultivation. But the major problem facing the breeders and the farmers in this crop is the heavy flower shedding with the consequential low pod setting. This peculiar defect has a depressing effect on the total yield in this crop. To give a scientific explanation to this phenomenon and also to assess the variations, if any, among varieties, flower and pod setting was studied in four avarai varieties, viz., DL.250, DL.269, DL.453 and DL.692 at the Pulses Research Station, Jayankondam.

The inflorescences were carefully selected so that the first flower on all the inflorescences in the four varieties open on the same day. Flower opening was recorded for 22 days when all the buds on all the inflorescences in the four varieties have opened. This way, it was possible to fix the number of flowers opened daily on each of the inflorescences. The number of pods set on the inflorescence finally was recorded.

There was varietal difference in flower and pod setting. The variety DL.692 produced the maximum number of flowers followed by DL.250, DL.453, and DL.269. It was interesting that DL. 269 which produced the lowest number of flowers recorded the highest pod set (22.3%) followed by DL. 692, DL. 453 and DL. 250 with 15.9%, 5% and 4.9%, respectively.

It was also noted that the percentage of pod set alone cannot be taken as a criterion in judging the yield behavior of the variety. The ultimate yield of pods depended upon the percentage of flower dropping. The more the shedding of flowers, the less was the pod set. This was evident in the variety DL.250, while the shedding was the least in DL.269 with higher percentage of pod set with the other two varieties falling in between. Yet the variety DL.692 developed the highest number of pods per inflorescence.

 
 
Chinnaswamy, (1979): Source–Sink relationship in Dolichos Lablab.
 
Karivaratharaju and Ramamoorthy, (1990): Photosynthesis by fruit walls of Lablab bean and their role in seed development.
 
Singh,(1990): Leaf-area estimation in hyacinth bean by non-destructive linear method
 
Kim and Do,(1995): Control of growth habit in determinate Lablab bean by temperature and photoperiod.
 
Kim and Okubo, (1996): Hormonal control of growth habit in determinate Lablab.
 
Saud, et al., (1997): A method of leaf area determination in Dolichos lablab.
 
Uddin, et al., (1998): Studies on phenology and fruiting behaviour in Lablab bean.
 
Hall and Naidu, (2004): Genotypic difference for drought resistance
 
Raghubansh et al. (2011): Supplemental UV-B radiation induced changes in growth, pigments and antioxidant pool of bean (Dolichos lablab) under field conditions.
 

The Stipules Pulvinus and Stipeles of Dolichos LabaLab L. and their Vascular Supply

Studies on Source and Sink Limitations on Pod Set and Productivity In Determinate Variety of Field Bean