Details
| Original language | English |
|---|---|
| Pages (from-to) | 168-178 |
| Number of pages | 11 |
| Journal | Pesticide Science |
| Volume | 54 |
| Issue number | 2 |
| Publication status | Published - 1998 |
| Externally published | Yes |
Abstract
Bioassays were adapted to investigate effects of droplet size and carrier volume on performance of daminozide, gibberellic acid (GA3) and 2,4-D using Phaseolus vulgaris L. as a model system. Response to plant growth regulators was indexed by inhibition (daminozide), promotion of internede elongation (GA3) or ethylene production (2,4-D). Elongation of first plus second internodes above primary leaves was evaluated 14 days after treatment of primary leaves, while ethylene production was determined from head-space samples of incubated leaves 24 h after treatment. Daminozide inhibition of internode elongation was related to decreased cell size and number in pith and epidermis (range 49-70% of the untreated control). GA3 increased cell size and number in both tissues 2.3- to 4.8-fold. Responsiveness to daminozide and 2,4-D markedly decreased as seedling age increased from 8 to 12 days, but responsiveness to GA3 increased. Decreasing droplet size (10-0.5 μl) and increasing carrier volume (10-200 μl per leaf) at constant dose of daminozide (100 μg per leaf) and 2,4-D (100 μg per leaf) significantly increased performance, but had little effect on performance of GA3 (2 μg per leaf). Effects of application factors on performance were related to their effects on the interface area between droplets and leaf surface. Significant positive linear relationships were obtained between plant response and the logarithm of the droplet/leaf interface area for all growth regulators.
Keywords
- 2,4-D, Alar, Carrier volume, Daminozide, Droplet size, Gibberellic acid
ASJC Scopus subject areas
- Immunology and Microbiology(all)
- Applied Microbiology and Biotechnology
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In: Pesticide Science, Vol. 54, No. 2, 1998, p. 168-178.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Spray application factors and plant growth regulator performance
T2 - I. Bioassays and biological response
AU - Knoche, M.
AU - Bukovac, M. J.
AU - Nakagawa, S.
AU - Crabtree, G. D.
PY - 1998
Y1 - 1998
N2 - Bioassays were adapted to investigate effects of droplet size and carrier volume on performance of daminozide, gibberellic acid (GA3) and 2,4-D using Phaseolus vulgaris L. as a model system. Response to plant growth regulators was indexed by inhibition (daminozide), promotion of internede elongation (GA3) or ethylene production (2,4-D). Elongation of first plus second internodes above primary leaves was evaluated 14 days after treatment of primary leaves, while ethylene production was determined from head-space samples of incubated leaves 24 h after treatment. Daminozide inhibition of internode elongation was related to decreased cell size and number in pith and epidermis (range 49-70% of the untreated control). GA3 increased cell size and number in both tissues 2.3- to 4.8-fold. Responsiveness to daminozide and 2,4-D markedly decreased as seedling age increased from 8 to 12 days, but responsiveness to GA3 increased. Decreasing droplet size (10-0.5 μl) and increasing carrier volume (10-200 μl per leaf) at constant dose of daminozide (100 μg per leaf) and 2,4-D (100 μg per leaf) significantly increased performance, but had little effect on performance of GA3 (2 μg per leaf). Effects of application factors on performance were related to their effects on the interface area between droplets and leaf surface. Significant positive linear relationships were obtained between plant response and the logarithm of the droplet/leaf interface area for all growth regulators.
AB - Bioassays were adapted to investigate effects of droplet size and carrier volume on performance of daminozide, gibberellic acid (GA3) and 2,4-D using Phaseolus vulgaris L. as a model system. Response to plant growth regulators was indexed by inhibition (daminozide), promotion of internede elongation (GA3) or ethylene production (2,4-D). Elongation of first plus second internodes above primary leaves was evaluated 14 days after treatment of primary leaves, while ethylene production was determined from head-space samples of incubated leaves 24 h after treatment. Daminozide inhibition of internode elongation was related to decreased cell size and number in pith and epidermis (range 49-70% of the untreated control). GA3 increased cell size and number in both tissues 2.3- to 4.8-fold. Responsiveness to daminozide and 2,4-D markedly decreased as seedling age increased from 8 to 12 days, but responsiveness to GA3 increased. Decreasing droplet size (10-0.5 μl) and increasing carrier volume (10-200 μl per leaf) at constant dose of daminozide (100 μg per leaf) and 2,4-D (100 μg per leaf) significantly increased performance, but had little effect on performance of GA3 (2 μg per leaf). Effects of application factors on performance were related to their effects on the interface area between droplets and leaf surface. Significant positive linear relationships were obtained between plant response and the logarithm of the droplet/leaf interface area for all growth regulators.
KW - 2,4-D
KW - Alar
KW - Carrier volume
KW - Daminozide
KW - Droplet size
KW - Gibberellic acid
UR - http://www.scopus.com/inward/record.url?scp=0031773196&partnerID=8YFLogxK
U2 - 10.1002/(SICI)1096-9063(1998100)54:2<168::AID-PS800>3.0.CO;2-Q
DO - 10.1002/(SICI)1096-9063(1998100)54:2<168::AID-PS800>3.0.CO;2-Q
M3 - Article
AN - SCOPUS:0031773196
VL - 54
SP - 168
EP - 178
JO - Pesticide Science
JF - Pesticide Science
SN - 0031-613X
IS - 2
ER -