Abstract
After postharvest shipping, the lower leaves of zonal geranium ( Pelargonium × hortorum ) cuttings often turn chlorotic and necrotic during rooting in a propagation environment. Our objective was to quantify the efficacy of spray applications of the plant growth regulators (PGRs) benzyladenine (BA) and/or gibberellic acid (GA) at various stages in propagation to reduce lower-leaf senescence and evaluate effects on subsequent rooting. In Expt. 1, cuttings of ‘Patriot White’ geraniums were harvested and treated with BA (2.5 or 5.0 mg·L −1 ), BA + GA 4+7 (2.5 or 5.0 mg·L −1 each), or GA 3 (0.5 or 2.0 mg·L −1 ) either before or after a 2-day storage period simulating commercial shipping. Post-shipment application of all PGRs eliminated leaf yellowing compared with cuttings treated pre-shipment, but rooting was inhibited. In Expt. 2, the promotion of rooting from a rooting hormone preceding treatment with BA (1.25 to 5.0 mg·L −1 ), BA+GA 4+7 (1.25 to 5.0 mg·L −1 each), or GA 3 (0.25 to 2.0 mg·L −1 ) was evaluated on ‘Patriot White’ geranium cuttings after a 2-day simulated shipping. Applying rooting hormones increased the percentage of fully rooted cuttings treated with BA and/or GA from 16.4% to 51.8%. In Expt. 3, cuttings of different geranium cultivars from a commercial producer varied in susceptibility and suppression of leaf yellowing after BA + GA 4+7 applications. We conclude that foliar applications of BA + GA 4+7 can suppress lower-leaf senescence and rooting during propagation of some geranium cultivars, and the inhibition of rooting can be at least partially overcome with an application of rooting hormone.
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Claims 4
Claim · model-written summary
Post-shipment plant growth regulator application eliminated leaf yellowing relative to pre-shipment application.
- Treatment
- Post-shipment application of all PGRse0
- Outcome
- leaf yellowinge0
- Direction
- eliminatede0
- Comparator
- cuttings treated pre-shipmente0
GeraniumOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Post-shipment application of all PGRs eliminated leaf yellowing compared with cuttings treated pre-shipment”
t0“Geraniums”
Claim · model-written summary
Post-shipment application of plant growth regulators inhibited rooting.
- Treatment
- Post-shipment application of all PGRse0
- Outcome
- rootinge0
- Direction
- inhibitede0
- Comparator
- cuttings treated pre-shipmente0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Post-shipment application of all PGRs eliminated leaf yellowing compared with cuttings treated pre-shipment, but rooting was inhibited”
t0“Geraniums”
Claim · model-written summary
Rooting hormones increased fully rooted BA and/or GA treated cuttings from 16.4% to 51.8%.
- Treatment
- Applying rooting hormonese0
- Outcome
- percentage of fully rooted cuttingse0
- Direction
- increasede0
- Value
- from 16.4% to 51.8%e0
- Comparator
- cuttings treated with BA and/or GAe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Applying rooting hormones increased the percentage of fully rooted cuttings treated with BA and/or GA from 16.4% to 51.8%”
t0“Geraniums”
Claim · model-written summary
Geranium cultivars differed in susceptibility to leaf yellowing and its suppression by BA plus GA.
- Material
- different geranium cultivarse0
- Treatment
- BA + GA 4+7 applicationse0
- Outcome
- susceptibility and suppression of leaf yellowinge0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cuttings of different geranium cultivars from a commercial producer varied in susceptibility and suppression of leaf yellowing after BA + GA 4+7 applications”
t0“Geraniums”
The same questions in other papers
class · growth · GeraniumPositive and negative results
3 papers in the same direction as this paper · 3 in the opposite direction
- negative
- no effect
- no effect
3 papers more in this group
See all 7 papers →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.