Andrew D. Parry

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Carotenoid and abscisic acid (ABA) levels were determined in endosperm, embryos and seedlings of wild-type and viviparous (vp) mutants ofZea mays L. Carotenoid concentrations were determined by absorption spectrometry following purification by high-performance liquid chromatography and ABA concentrations by combined gas chromatography-mass spectrometry.(More)
Selection for cytokinin resistance by incubating M2 seed of Nicotiana plumbaginifolia, after ethylmethanesulphonate mutagenesis, on 20 μM 6-benzylami-nopurine resulted in the isolation of a monogenic, recessive mutant, CKR1. Germination of the mutant is less sensitive to cytokinin inhibition than the wild type, and leaf development of the mutant occurs at(More)
A mutant of Nicotiana plumbaginifolia, CKR1, isolated on the basis of its enhanced resistance to cytokinins was found to have a greater tendency to wilt than the wild type (Blonstein et al., 1991, Planta 183, 244–250). Further characterisation has shown that the wiltiness in the mutant is not caused by an insensitivity to abscisic acid (ABA) because the(More)
Using 13C-labelled internal standards and gas chromatography-mass spectrometry/multiple-ion monitoring the levels of xanthoxin (Xan) and 2-trans-xanthoxin (t-Xan) have been determined in stressed and non-stressed leaves of wildtype tomato (Lycopersicon esculentum Mill cv. Ailsa Craig), and the wilty mutants, notabilis (not), flacca (flc) and sitiens (sit).(More)
Evidence has been obtained which is consistent with 9′-cis-neoxanthin being a major precursor of abscisic acid (ABA) in higher plants. A mild, rapid procedure was developed for the extraction and analysis of carotenoids from a range of tissues. Once purified the carotenoids were identified from their light-absorbance properties, reactions with dilute acid,(More)
The endogenous levels of abscisic acid (ABA) and jasmonic acid (JA) were analyzed in wheat seedlings grown in water, a system which in the past has been used to test the effects of these plant growth inhibitors. The levels in different plant parts and in the medium were measured by gas chromatography-mass spectrometry-selected ion monitoring, using [2H3]ABA(More)
Cardiac trauma requiring immediate surgical intervention is usually thought of as a rare event. However, our recent experience at Leicester Royal Infirmary suggests that this clinical situation is on the increase, and has highlighted potential problems in the management of these patients. It is essential that all units that may have to deal with these(More)