Abstract
Castor (Ricinus communis) is an oilseed usually cultivated in tropical and semi-arid conditions. The slow and uneven germination of castor seed is causing poor crop establishment and reduced seed yield. This series of studies investigated several factors influencing the time for castor seed germination and seedling emergence. Studies were made on the effect of seed coat permeability to water and the influences of temperature, morphology, and the hormone gibberellin. The best temperature for castor seed germination was near 31 °C, and the seed coat was permeable to water. The mechanical resistance of the seed coat was a mechanism controlling the germination of the castor seed. The time for germination was strongly associated with the seed coat relative weight, but it had little influence from other morphological characteristics. After the castor plants were subjected to three cycles of selection for fast germination, the seed weight was reduced, the caruncle became larger, and the seed coat became thinner. Gibberellin applied to the seed promoted a faster and higher germination rate. Pre-germination of the castor seed was not effective for promoting faster seedling emergence. Attempts to improve castor seed germination should integrate the many factors that influence this physiological process.
Abstract from the paper’s OpenAlex record; open copy licensed cc-by. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 11
Claim · model-written summary
Castor seed germination was best near 31 °C.
- Taxon
- castor
Ricinus communise0 - Outcome
- castor seed germinatione0
- Direction
- beste0
- Value
- 31 °Ce0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The best temperature for castor seed germination was near 31 °C”
Claim · model-written summary
Castor seed coats were permeable to water.
- Taxon
- CastorRicinus communist0
- Outcome
- seed coat was permeable to watere0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the seed coat was permeable to water”
t0“Castor”
Claim · model-written summary
Seed coat mechanical resistance controlled castor seed germination.
- Taxon
- castorRicinus communise0
- Outcome
- germination of the castor seede0
- Qualifier
- mechanical resistance of the seed coate0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The mechanical resistance of the seed coat was a mechanism controlling the germination of the castor seed”
Claim · model-written summary
Germination time was strongly associated with relative seed coat weight.
- Taxon
- CastorRicinus communist0
- Organ / stage
- seed coate0
- Outcome
- time for germinatione0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The time for germination was strongly associated with the seed coat relative weight”
t0“Castor”
Claim · model-written summary
Other morphological traits had little influence on germination time.
- Taxon
- CastorRicinus communist0
- Organ / stage
- other morphological characteristicse0
- Outcome
- little influencee0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“it had little influence from other morphological characteristics”
t0“Castor”
Claim · model-written summary
Three cycles of fast-germination selection reduced seed weight.
- Taxon
- castorRicinus communise0
- Treatment
- three cycles of selection for fast germinatione0
- Outcome
- seed weighte0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After the castor plants were subjected to three cycles of selection for fast germination, the seed weight was reduced, the caruncle became larger, and the seed coat became thinner”
Claim · model-written summary
Three cycles of fast-germination selection enlarged the caruncle.
- Taxon
- castorRicinus communise0
- Treatment
- three cycles of selection for fast germinatione0
- Outcome
- carunclee0
- Direction
- largere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After the castor plants were subjected to three cycles of selection for fast germination, the seed weight was reduced, the caruncle became larger, and the seed coat became thinner”
Claim · model-written summary
Three cycles of fast-germination selection thinned the seed coat.
- Taxon
- castorRicinus communise0
- Treatment
- three cycles of selection for fast germinatione0
- Outcome
- seed coate0
- Direction
- thinnere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“After the castor plants were subjected to three cycles of selection for fast germination, the seed weight was reduced, the caruncle became larger, and the seed coat became thinner”
Claim · model-written summary
Applied gibberellin accelerated and increased castor germination.
- Taxon
- CastorRicinus communist0
- Treatment
- Gibberellin applied to the seede0
- Outcome
- germination ratee0
- Direction
- faster and highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Gibberellin applied to the seed promoted a faster and higher germination rate”
t0“Castor”
Claim · model-written summary
Pregermination did not speed castor seedling emergence.
- Taxon
- castorRicinus communise0
- Treatment
- Pre-germinatione0
- Outcome
- seedling emergencee0
- Direction
- not effectivee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Pre-germination of the castor seed was not effective for promoting faster seedling emergence”
Claim · model-written summary
The authors recommend integrating multiple germination factors when improving castor seed germination.
- Taxon
- castorRicinus communise0
- Outcome
- integrate the many factors that influence this physiological processe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Attempts to improve castor seed germination should integrate the many factors that influence this physiological process”
The same questions in other papers
class · growth · Ricinus communis (castor bean)Positive and negative results
1 in the opposite direction
- negative
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.