EarlySeason Morphological and Physiological Responses of Resistant and Susceptible Cotton Genotypes to Reniform Nematode and Soil Nitrogen

Bhupinder Singh,John L Snider,Akanksha Sehgal,Kambham Raja Reddy,L Jason Krutz,Daryl R Chastain,Salliana R Stetina

doi:10.3390/agronomy10121974

Abstract

Soil fertility and reniform nematode (RN) directly affect earlyseason growth and physiology of cotton. The growth responses to soil fertility and RN may, however, vary across germplasm. A greenhouse study was conducted to gain information on the role that host plant resistance plays in influencing RN populations, and cotton growth and physiological response to a range of soil nitrogen (N) levels in the presence and absence of RN. RN-resistant cotton lines (08SS110-NE06.OP and 08SS100) along with susceptible cultivars (Deltapine 16 and PHY 490 W3FE) were subjected to four levels of N from planting until biomass harvesting, 60 days after planting(DAP), under the presence orabsence of RN. The linear and quadratic functions (r2 = 0.72 to 0.99) bestdescribed measured responses of cotton genotypes to soil N. However, the responses were not different among genotypes, except for plant height at 30 DAP. This study revealed significant increases in several morphological parameters with increasing rates of N. RN population in the pots grown with resistant lines was lower whencompared to susceptible cultivars at biomassharvest. Physiological responses indicated that 08SS110-NE06.OP was more resilient to RN stress than other genotypes. The information from this study could be useful in managing the early season growth of cotton.

Highlights

Negative fiber yield impacts due to Rotylenchulusreniformis (RN) in cotton in the U.S Mid-South have drawn the attention of scientists aiming to mitigate the problem through modifications in management strategies and host plant resistance
In subsequent sections of the results, we address growth and physiological responses for each sampling period
The following sections were organized into genotype, nitrogen, and reniform nematode main effects and significant interactions between treatments (Tables 1 and 2)

Summary

Introduction

Negative fiber yield impacts due to Rotylenchulusreniformis (RN) in cotton in the U.S Mid-South have drawn the attention of scientists aiming to mitigate the problem through modifications in management strategies and host plant resistance. Disease Database report, the percent loss in cotton production from reniform nematode ranged between. Some scientists have evaluated variations in fertilizer management as possible tools to minimize the plant-parasitic nematodes’negative impacts without the additional cost of nematicide application [5,6,7]. The economic analysis by McLeann et al [12] indicated that value of additional yield increase in reniform nematode-infested cotton fields from the application of anhydrous ammoniais USD 7.45/acre considering the market price of USD 0.50/lb minus the input cost. An additional nitrogen application has been considered economically worthwhile to reduce reinform nematode damage in cotton.several other studies have reported either a positive or no influence of soil nutrition on nematode populations [13,14]

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Discussion

Conclusion