A comparison of root characteristics in relation to nutrient and water stress in two maize hybrids

Vamerali, Teofilo; Saccomani, Massimo; Bona, Stefano; Mosca, Giuliano; Guarise, M.; Ganis, A.

doi:10.1023/a:1026123129575

Cited by 63 publications

(37 citation statements)

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“…On the other hand, high nitrogen supply resulted in stimulation in shoot growth and an inhibition of overall root growth [17] and of lateral root formation [18]. Similar result was presented in previous study, as the root/shoot ratio decreased with increasing N supply when the nitrogen supply above the optimal quantity [19]. Our results indicated that high N supply did drive an alternation in the ratio of the aboveground and belowground biomass in tobacco seedlings.…”

Section: Discussionsupporting

confidence: 89%

Effect of Nitrogen Fertilization on Growth and Photosynthetic Nitrogen use Efficiency in Tobacco (Nicotiana tabacum L.)

Jiang¹,

Zu²,

Wang³

2015

JLS

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Abstract:Soil pot experiments were conducted in a greenhouse to examine the effects of different nitrogen (N) supply (low, 0.15 g N/kg; middle, 0.3 g N/kg; and high, 0.6 g N/kg dry soil) on the growth, photosynthetic characteristics and photosynthetic nitrogen use efficiency (PNUE) of tobacco seedlings (Nicotiana tabacum L. Yunyan 87). The results showed middle and high N significantly enhanced seedling growth including plant stem and leaf dry weight comparing with low N. High N supply could lead to a dramatic increase in the photosynthetic capacity of tobacco seedlings under low N conditions. There were significant differences in leaf N content between nitrogen treatments. About a 76% increase in leaf N content in plants fed by high N resulted in about 43% increase in Rubisco content and 27% in net photosynthetic rate. The non-corresponding increases in photosynthetic rate in tobacco seedlings fed by high N relative to low N resulted from Rubisco activity and/or carboxylation efficiency (CE). These results indicated that tobacco seedlings under high N application can maintain high net photosynthetic rate (P n ) but lower PNUE, will finally result in a decline in N use efficiency.

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Section: Discussionsupporting

confidence: 89%

Effect of Nitrogen Fertilization on Growth and Photosynthetic Nitrogen use Efficiency in Tobacco (Nicotiana tabacum L.)

Jiang¹,

Zu²,

Wang³

2015

JLS

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“…Under water availability limitations, Sorghum halepense responded like an anisohydric species, slowing down the decrease in stomatal conductance at the expense of ψ l potential. The greater competitive ability observed in Sorghum halepense is in agreement with that noted by Taiz and Zeiger (2010) and Vamerali et al (2003), who reported that once the appropriate water levels were recovered, active gas exchange in periods of fluctuating water availability allowed higher growth rates and the maintenance of productivity in anisohydric species. Thus, an active gas exchange during water deficit, like that of Sorghum halepense, could lead to greater aggressivity, negatively affecting the productivity of the crop with which it competes.…”

Section: Gas Exchangesupporting

confidence: 90%

Leaf gas exchange and competitive ability of Zea mays and Sorghum halepense as affected by water competition

Acciaresi¹,

Yanniccari

Leguizamón

et al. 2012

Acta Agronomica Hungarica

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In an environment involving water deficit and competition, weed species may show inefficient water use. The aim was to determine the water consumption strategy of Zea mays and Sorghum halepense and the effects of these strategies on crop and weed competitive ability.Under two soil water availability conditions, the soil and leaf water potential (Ψ l ), relative water content (RWC) and leaf gas exchange parameters were measured during the critical period of crop competition in pot experiments where Z. mays and S. halepense were grown alone or in competition. In addition, the relative yield total and aggressivity index of both species were calculated.S. halepense showed continuous absorption of water, reaching a lower Ψ l than the Z. mays hybrids. S. halepense maintained a RWC of above 90%, which only decreased to 70% in the case of competition for low water supplies. In Z. mays, RWC declined to values of 70% at both water levels. S. halepense exhibited active leaf gas exchange. Z. mays hybrids had lower competitive ability than S. halepense at both competition levels due to their conservative water use strategy. Sustained water use by the weed could be the cause of the increased aggressivity of S. halepense under water deficit conditions.

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“…De este modo, híbridos de Z.mays que muestren una estrategia de conservación del agua edáfica durante el período crítico de competencia V 4 -V 7 , podrían brindarle una ventaja competitiva a las malezas si estas presentan un "consumo de lujo" durante el período de competencia (Patterson, 1995). La mayor habilidad competitiva observada en S.halepense concuerda con lo establecido por Taiz y Zeiger (2006) y Vamerali et al (2003) quienes determinan que un activo intercambio gaseoso ante la ocurrencia de períodos fluctuantes de disponibilidad de agua, tal como sucede con frecuencia durante el ciclo de los cultivos, permite alcanzar mayores tasas de crecimiento y el mantenimiento de la productividad, una vez restablecidos los niveles hídricos adecuados. De este modo, un activo intercambio gaseoso como el que presentó S.halepense, favorecería a la mayor agresividad (tanto en la captación de agua como en la producción de materia seca aérea) y afectaría la productividad del cultivo con el que compite.…”

Section: Intercambio Gaseosounclassified

Competencia entre Zea mays y Sorghum halepense por agua edáfica y su incidencia en el intercambio gaseoso foliar

Acciaresi¹,

Zuluaga²,

Yanniccari³

et al. 2012

ECOS

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A comparison of root characteristics in relation to nutrient and water stress in two maize hybrids

Cited by 63 publications

References 0 publications

Effect of Nitrogen Fertilization on Growth and Photosynthetic Nitrogen use Efficiency in Tobacco (Nicotiana tabacum L.)

Effect of Nitrogen Fertilization on Growth and Photosynthetic Nitrogen use Efficiency in Tobacco (Nicotiana tabacum L.)

Leaf gas exchange and competitive ability of Zea mays and Sorghum halepense as affected by water competition

Competencia entre Zea mays y Sorghum halepense por agua edáfica y su incidencia en el intercambio gaseoso foliar

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