Effects of leaf blast on growth and production of a rice crop. 2. Analysis of the reduction in dry matter production, using two models with different complexity

Bastiaans, L.

doi:10.1007/bf03041392

Cited by 17 publications

(12 citation statements)

References 15 publications

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“…Since first Striga infection on CK60‐B in 1999 was already observed at 23 DAS, it is suggested that host plants can particularly benefit from delayed infection when first infection occurs early. Previously, such a strong sensitivity to infection time during early growth stages was demonstrated for various fungal leaf pathogens like powdery mildew ( Erysiphe graminis ) and stripe rust ( Puccinia hordei ) on spring barley (Lim & Gaunt, 1986), late blight ( Phytophthora infestans ) on potato (Van Oijen, 1991) and leaf blast ( Magnaporthe grisea ) on rice (Bastiaans, 1993). It is obvious that the consequences of a physiological disturbance following infection will be stronger with smaller host plants.…”

Section: Discussionmentioning

confidence: 99%

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The role of infection time in the differential response of sorghum cultivars to Striga hermonthica infection

Ast¹,

Bastiaans²

2006

Weed Research

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Summary Striga hermonthica is an important parasitic weed that severely reduces yields of sorghum in sub‐Saharan Africa. Pot experiments with the sensitive sorghum cultivar CK60‐B and the tolerant Tiémarifing were conducted in 1999 and 2000 to investigate the role of infection time on the interaction between sorghum and Striga hermonthica. Timing of Striga inoculation was used to establish delays of one and two weeks in first attachment of the parasite. In 1999, early Striga inoculation resulted in a relatively early first Striga attachment on CK60‐B. Although first infection of Tiémarifing occurred one week later, an identical final number of emerged Striga plants was observed. Plants of CK60‐B were more severely affected and supported a higher total Striga biomass. Only with this cultivar the interaction between host and parasite was significantly affected by delayed infection. Parasite biomass was most sensitive and already significantly reduced following a 1‐week delay in infection time. With a further 1‐week delay, an additional reduction in parasite biomass was accompanied by a strong and significant increase in total and panicle dry weight of the host plant. In 2000, first infection of CK60‐B was relatively late and occurred simultaneously with first infection of Tiémarifing and no significant effect of delayed infection on Striga biomass or host‐plant performance was observed. The results indicate that the influence of delayed infection strongly depends on actual infection time and confirm that earlier observed differences in time of first infection between the two cultivars do contribute to the more tolerant response of Tiémarifing to Striga infection.

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Section: Discussionmentioning

confidence: 99%

“…The feedbacks that are operative in this complex relationship suggest that dynamic simulation models, which have been successfully applied with other host–pest (e.g. Bastiaans, 1993) and crop–weed relationships (e.g. Kropff et al.…”

Section: Discussionmentioning

confidence: 99%

The role of infection time in the differential response of sorghum cultivars to Striga hermonthica infection

Ast¹,

Bastiaans²

2006

Weed Research

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“…As a result, radiation interception was affected, which in turn contributed to the reduction in dry matter production. A more detailed analysis of the reduction in dry matter production will be given in a next paper (Bastiaans, 1993b). Harvest index for both healthy and inoculated crops was about 0.53, a common value for modem rice varieties (Yoshida, 1981).…”

Section: Discussionmentioning

confidence: 99%

Effects of leaf blast on growth and production of a rice crop

Bastiaans

1993

Netherlands Journal of Plant Pathology

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Rice crops grown under irrigated conditions were inoculated with Pyricularia oryzae during early growth stages to study the effect of leaf blast on yield formation. The inoculations led to severe epidemics of leaf blast around maximum tillering, characterized by the presence of typical blast lesions and an accelerated senescence of heavily infested leaf tissue. Leaf blast led to a prolonged tillering and a delay in flowering and maturity.Crop growth rate and leaf area formation declined sharply during establishment of the disease and continued to be reduced till maturity. This resulted in a marked reduction of total dry matter production and grain yield. Dry matter distribution was not affected. Leaf blast reduced spikelet number, 1000 grain weight, and the fraction filled grains. From this last observation it was concluded that the reduction in grain yield was exclusively source determined.Nitrogen uptake of the inoculated crops before flowering was reduced compared to the N uptake of the control crop, but shoot N content of the inoculated crops at flowering was higher. Uptake of nitrogen after flowering was negligible in both healthy and inoculated crops. Redistribution from vegetative tissue was therefore the main source of N for grain growth. The higher N content of the shoot organs in the inoculated crops during ripening led to the conclusion that the reduced N uptake was not responsible for the yield reduction observed. Consequently, the reduction in grain yield was solely determined by a reduced carbohydrate supply.

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“…Lucas et al (1998) and Be´asse et al (2000) showed that, when the disease established late, it affected radiation use efficiency (RUE) but had little or no effect on radiation intercepted efficiency (RIE). For other pathosystems, such as late blight/potato (van Oijen, 1991) and leaf blast/rice (Bastiaans, 1993), leaf area formation may be affected due to early growth retardation causing a feedback regulation, and disrupting leaf area formation. For Mp/pea, growth was generally reduced after the beginning of seed filling, and leaf area was no longer expanding at this stage (Be´asse et al, 2000).…”

Section: Introductionmentioning

confidence: 98%

Improvement and validation of a pea crop growth model to simulate the growth of cultivars infected with Ascochyta blight (Mycosphaerella pinodes)

et al. 2005

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A model simulating the growth of a pea crop infected with Ascochyta blight was improved and validated using 6 spring pea cultivars, all equally susceptible to Ascochyta blight, but differing in architectural features (stem height, branching ability, standing ability). This model takes into account the spatial distribution of the disease, including the contribution of each layer of the canopy to the radiation interception efficiency (RIE) and the radiation use efficiency (RUE) of the crop. The decreasing contribution of each layer due to the disease was estimated by the relationship between the photosynthesis of a layer and its disease score. The effect of disease on photosynthesis was assessed in controlled conditions as a means of evaluating the effect of disease on each cultivar. All cultivars were affected equally. In field conditions, cultivars with different canopy architectures displayed differences in the profile of disease on leaves. Cultivar Aladin reached higher disease levels at the top of the plant. Epidemics affected crop growth, and the cultivars tested differed in the magnitude of the decrease in growth. Observed and simulated data were compared. The disease-coupled crop growth model gave satisfactory predictions of crop growth for the six cultivars tested.

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Effects of leaf blast on growth and production of a rice crop. 2. Analysis of the reduction in dry matter production, using two models with different complexity

Cited by 17 publications

References 15 publications

The role of infection time in the differential response of sorghum cultivars to Striga hermonthica infection

The role of infection time in the differential response of sorghum cultivars to Striga hermonthica infection

Effects of leaf blast on growth and production of a rice crop

Improvement and validation of a pea crop growth model to simulate the growth of cultivars infected with Ascochyta blight (Mycosphaerella pinodes)

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