Abstract
Factors associated with variation in harvest index and approaches to improve harvest index (HI) and productivity in sunflower are discussed in this article. In recent years, higher productivity in sunflower has been achieved mainly through increased crop growth rates. Besides, an improvement in harvest index also has contributed for improved productivity to a certain extent. In our study we observed that medium duration types (100 to 110 days) had high HI compared with early or long-duration varieties and we also attempted to understand the ways and means to improve HI in sunflower types with varied duration. Genotypes which had low partitioning of dry matter to stem plus thalamus had high HI. Genotypes which accumulated high biomass during post flowering stages of development also showed high HI and seed yield. In a few genotypes remobilization of photosynthates from vegetative plant parts to the seed resulted in high HI and seed yield. Among the sink characters, the number of seed per head, test weight and seed density (weightvolume) also contributed to achieving high HI values. Identification and selection of genotypes based on these criteria will increase the production further. Since large amount of biomass is still locked up in the vegetative plant parts, any practice to manipulate the mobilization of photosynthates from vegetative parts to head also improves HI and thus seed yield. In our experiment, we observed that foliar application of boron nutrient and application of growth regulators to the head improved the translocation of photosynthates to the head and thus increased the HI and seed yield.
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Claims 11
Claim · model-written summary
Medium duration sunflower types had higher harvest index than early or long duration varieties.
- Taxon
- sunflower
Helianthus annuust0 - Material
- medium duration typese0
- Outcome
- HIe0
- Direction
- highe0
- Qualifier
- 100 to 110 dayse0
- Comparator
- early or long-duration varietiese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“medium duration types (100 to 110 days) had high HI compared with early or long-duration varieties”
t0“sunflower”
Claim · model-written summary
Low dry matter partitioning to stem and thalamus was associated with high harvest index.
- Taxon
- sunflowerHelianthus annuust0
- Material
- Genotypese0
- Outcome
- HIe0
- Direction
- highe0
- Qualifier
- low partitioning of dry matter to stem plus thalamuse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Genotypes which had low partitioning of dry matter to stem plus thalamus had high HI”
t0“sunflower”
Claim · model-written summary
High post flowering biomass accumulation was associated with high harvest index and seed yield.
- Taxon
- sunflowerHelianthus annuust0
- Material
- Genotypese0
- Outcome
- HI and seed yielde0
- Direction
- highe0
- Qualifier
- high biomass during post flowering stages of developmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Genotypes which accumulated high biomass during post flowering stages of development also showed high HI and seed yield”
t0“sunflower”
Claim · model-written summary
In some genotypes photosynthate remobilization to seed produced high harvest index and seed yield.
- Taxon
- sunflowerHelianthus annuust0
- Material
- genotypese0
- Outcome
- high HI and seed yielde0
- Qualifier
- remobilization of photosynthates from vegetative plant parts to the seede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In a few genotypes remobilization of photosynthates from vegetative plant parts to the seed resulted in high HI and seed yield”
t0“sunflower”
Claim · model-written summary
Seed number, test weight and seed density contributed to high harvest index.
- Taxon
- sunflowerHelianthus annuust0
- Organ / stage
- seede0
- Outcome
- high HI valuese0
- Direction
- highe0
- Qualifier
- number of seed per head, test weight and seed densitye0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the number of seed per head, test weight and seed density (weightvolume) also contributed to achieving high HI values”
t0“sunflower”
Claim · model-written summary
Selecting genotypes by these criteria is predicted to increase production.
- Taxon
- sunflowerHelianthus annuust0
- Outcome
- Identification and selection of genotypes based on these criteriae0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Identification and selection of genotypes based on these criteria will increase the production further”
t0“sunflower”
Claim · model-written summary
Manipulating photosynthate movement to the head is proposed to improve harvest index and seed yield.
- Taxon
- sunflowerHelianthus annuust0
- Outcome
- practice to manipulate the mobilization of photosynthates from vegetative parts to heade0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“any practice to manipulate the mobilization of photosynthates from vegetative parts to head also improves HI and thus seed yield”
t0“sunflower”
Claim · model-written summary
Foliar boron improved photosynthate translocation to sunflower heads.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- foliar application of boron nutriente0
- Outcome
- translocation of photosynthates to the heade0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“foliar application of boron nutrient and application of growth regulators to the head improved the translocation of photosynthates to the head and thus increased the HI and seed yield”
t0“sunflower”
Claim · model-written summary
Foliar boron increased harvest index and seed yield.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- foliar application of boron nutriente0
- Outcome
- HI and seed yielde0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“foliar application of boron nutrient and application of growth regulators to the head improved the translocation of photosynthates to the head and thus increased the HI and seed yield”
t0“sunflower”
Claim · model-written summary
Growth regulators on the head improved photosynthate translocation.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- application of growth regulators to the heade0
- Outcome
- translocation of photosynthates to the heade0
- Direction
- improvede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“foliar application of boron nutrient and application of growth regulators to the head improved the translocation of photosynthates to the head and thus increased the HI and seed yield”
t0“sunflower”
Claim · model-written summary
Growth regulators on the head increased harvest index and seed yield.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- application of growth regulators to the heade0
- Outcome
- HI and seed yielde0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“foliar application of boron nutrient and application of growth regulators to the head improved the translocation of photosynthates to the head and thus increased the HI and seed yield”
t0“sunflower”
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