Picloram Uptake, Translocation, and Efficacy in Relation to Water Status of Russian Knapweed ( Acroptilon repens )
1995; Cambridge University Press; Volume: 43; Issue: 1 Linguagem: Inglês
10.1017/s0043174500080796
ISSN1550-2759
AutoresRobert Morrison, Norman K. Lownds, Tracy M. Sterling,
Tópico(s)Agriculture, Soil, Plant Science
ResumoPicloram uptake, translocation, and efficacy were studied using greenhouse-grown Russian knapweed plants. Uptake of 14 C-picloram, applied as discrete droplets to adaxial leaf surfaces of well-watered plants, averaged less than 10% of that applied. Most uptake occurred within 30 min of application. Uptake increased linearly with external picloram concentrations from 6.2 to 74.5 mM and was proportional to picloram concentration. Only about 10% of absorbed picloram was translocated out of the treated leaf of well-watered plants within 96 h, with approximately equal acropetal and basipetal translocation. Water stress before, at the time of, and after picloram application did not affect picloram uptake, but reduced total translocation and increased the relative amount translocated basipetally. Water stress also reduced picloram efficacy. Although Silwett L-77 increased picloram uptake into Russian knapweed leaves, it did not increase efficacy under water stress conditions.
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