p pa pb pc pd pe pf pg ph pi pk pl pm pn po pp pr ps pt pu pv pw px py

Перевод: petiole

[существительное]
черешок листа

Тезаурус:

1. As chilling of the petiole of leaf 1 inhibited phloem translocation for about 20min, we assayed the effects of chilling the petiole on heat stimulus-induced systemic accumulation of pin activity in leaf 2 and on the systemic electrical signal.
2. Chilling the petiole of the wounded cotyledon to 3C has little effect on the electrical signal recorded on the petiole of leaf 1 (Fig. 1 c ), a result that is consistent with observations on action potential conduction at low temperature in cold-blooded animals and plants.
3. Chilling of the cotyledonary petiole (line 2) and excision of the cotyledon after chilling (line 3) do not induce detectable systemic pin activity.
4. Given the spontaneous recovery of the petiole tissue from chilling, it was necessary to excise the wounded cotyledon within the period in which phloem transport is inhibited in order to prevent any delayed movement of a chemical signal from the wound-site through the phloem.
5. Chilling the cotyledonary petiole to 0.5C extends the time for spontaneous recovery to about 25 minutes.
6. Mechanical damage applied to the lamina of one of the cotyledons of a tomato seedling with one expanded leaf (Fig. 1 a ) leads to electrical activity (Fig. 1 b ) which can be detected by extracellular electrodes placed on the stem and on the petiole of leaf 1, morphologically the lowest (first-formed) leaf (Fig. 1 a ).
7. As shown in Fig. 2, chilling of the cotyledonary petiole to 4C completely stops translocation of 11 C-labelled photosynthate through the chilled region for a period of at least ten minutes before a spontaneous recovery.
8. Similar results are obtained on chilling the petiole of leaf 1 to 3C, except that translocation is inhibited for at least 20 minutes.
9. The results are shown in Fig. 3: pin transcripts are below the level of detection in leaf 1 of untreated tomato seedlings and also after chilling of the cotyledonary petiole.
10. The data in Table 1 (lines 7-;9) show a close correspondence between the systemic pin activity and the systemic electrical response; chilling of the petiole did not affect these responses.
11. Chilling a petiole is, however, a recognized means of inhibiting phloem transport.