Variação do potencial da água da folha com o desenvolvimento da planta de batatinha (Solanum tuberosum L. cv. 'Bintje')

Scalopi, E.J.; Ferraz, Edinardo

doi:10.1590/s0071-12761974000100036

Cited by 1 publication

(1 citation statement)

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“…Evans et al (1975) frequently recorded values lower than these in nematode-infected plants. However, Scalopi & Ferraz (1974) point out that as potatoes age their leaf water potentials decrease, but that the relationship between relative water content of leaves and leaf water potential changes, leaf water potential becoming progressively lower for a given relative water content, so that both should be used as an indicator of physiological water deficit.…”

Section: (Ii) Water Use Eficiencymentioning

confidence: 99%

A review of tolerance by potato plants of cyst nematode attack, with consideration of what factors may confer tolerance and methods of assaying and improving it in crops

Evans

Haydock

1990

Annals of Applied Biology

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Plot\ w i t h dii average 01 8 cgg\/g 5011 Ploh with an acerage of 105 eggc/g 5011 C II I t i c a r hlaris Peer 24.8 Pentland Dell 46.3 Pentland Crown 55.9 Cam 5 9 . 4G. rostochiensis populations (almost half of all known infestations ; Howard, 1970). Repeated use of such cultivars in land with mixed populations of G . rostochiensis and G . pallida has selected G.paIlida, which is an increasing problem in the UK (Whitehead, 1986). It has taken longer to incorporate high levels of broadbased resistance from S. vernei into new cultivars.These are now becoming available and will add an extra weapon to the armoury of control measures which growers can use against potato cyst nematodes. However, many of these have proved intolerant of attack by potato cyst nematodes (Gurr, 1987). It is important that new cultivars with partial resistance to G. pallida are also tolerant and Haydock (1990) records three such cultivars as being more tolerant than the non-resistant controls. Painter (195 1) distinguished three main types of plant resistance to insects : non-preference, antibiosis and tolerance. Insects are more reluctant to colonise non-preferred plants and antibiosis retards the growth of individual insects and decreases their rate of reproduction. Tolerant plants can better withstand the effects of pest attack than can more sensitive plants. This classification confuses the effects of the plant on pest reproduction and the effects of the pest on plant growth under the general term 'resistance'. It is better to consider these effects as two independent aspects of the host-parasite relationship and to quantify each: a resistant host is often an intolerant host (indeed, some resistance mechanisms depend for their effect upon a hypersensitive response in challenged tissue) but a resistant host may also be tolerant. Fox & Spasoff (1976) showed that the resistance and tolerance of tobacco to the cyst nematode G. solanacearum (Miller and Gray) were independently inherited, and that appropriate crosses yielded progeny with all combinations of degrees of resistance and tolerance. Much evidence is now available to show that British potato cultivars differ in their ability to tolerate attack by potato cyst nematodes. Evans (1982~) showed that in heavily infested plots the yield of Cara was reduced by 4.8 t/ha compared with 24.6 tjha for Pentland Crown and 32.9 tjha for Pentland Dell (Table 1); Trudgill (1986a) listed other examples.Interest in tolerance of plants to nematode attack became more marked in the 1970's and this is shown by the numbers of publications relating to tolerance of 15 major genera of plant parasitic nematodes, or of potato cyst nematodes alone (Fig. 2). The numbers of publications were maintained at a high level for several years but have recently declined.In assessing cultivar reaction to nematode attack, the most obvious effect of potato cyst nematodes on potato plant growth is the stunting of root system development and the water stress that this causes. Compared to other plant species the potato is drough...

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Section: (Ii) Water Use Eficiencymentioning

confidence: 99%