Hyperspectral Properties of Rice Varieties with Varying Resistance Under Brown Planthopper (Nilaparvata lugens) Infestation

doi:10.16819/j.1001-7216.2024.230409

Abstract

Abstract:

【Objective】 The objective of this study is to investigate changes in hyperspectral reflectance curves and sensitive spectral features in rice varieties displaying varying resistance levels to brown planthopper infestation. Additionally, the study aims to examine changes in hyperspectral values in different parts of the rice plant. The obtained results are utilized to develop a machine learning model for identifying brown planthopper resistance, providing essential fundamental data for the development of intelligent technologies in identifying brown planthopper resistance. 【Method】 Three rice varieties (TN1, Mudgo, and RHT), each with varying resistance levels to brown planthoppers, were selected. The differences in hyperspectral values and vegetation indices were analyzed, and a random forest model was established to predict their resistance level. 【Results】 The study revealed that the number of significant spectral bands and the number of significant differences in spectral bands, significantly correlated with the duration of brown planthopper infestations, decrease with increasing resistance levels of the rice plant. At around 680 nm, the correlation with the duration of brown planthopper infestations was strongest for all three varieties. The analysis of vegetation indices showed that SIPI, SR605/760, and PSNDb had higher absolute values of correlation coefficients with resistance levels than those beyond 680 nm. Differences in different plant parts appeared first in TN1, a variety sensitive to brown planthoppers, followed by Mudgo, a moderately resistant variety, and finally RHT, a highly resistant one. The differences first appeared in the sheath of the first leaf, followed by the sheath of the second leaf, and the sheath of the third leaf. The results of the prediction model showed that the model with all spectral bands as input performed better than the random forest model built with a single vegetation index, SIPI, and achieved an accuracy of 85.9%.【Conclusion】 The study highlights spectral changes associated with brown planthopper resistance among rice varieties and different plant parts. It confirms the suitability of machine learning technology for predicting the resistance level of rice.

Key words: brown planthopper, rice resistance, hyperspectra, vegetation index, machine learning

摘要：

【目的】探究不同抗感水稻受褐飞虱胁迫的高光谱反射率曲线变化及敏感光谱差异，研究水稻植株不同部位的高光谱变化。在此基础上，采用机器学习技术建立水稻褐飞虱抗性鉴定模型，为下一步开发智能化褐飞虱抗性鉴定技术提供重要基础资料。【方法】以三个具不同褐飞虱抗感特征的水稻品种(TN1、Mudgo、RHT)为对象，分析其光谱、植被指数差异并建立抗性级别预测的随机森林模型。【结果】研究发现，褐飞虱胁迫天数与光谱反射率显著相关的波段数及差异显著的波段数随着水稻的抗性水平的上升而减少。同时，在680 nm左右，三个品种的光谱反射率与褐飞虫胁迫时间的相关性最好。植被指数分析表明， SIPI、SR_605/760和PSND_b与抗性级别的相关系数绝对值要高于680 nm的结果。感虫品种TN1差异最早体现，中抗品种Mudgo其次，高抗品种RHT最后。不同部位的差异首先出现在第1叶叶片和第1叶叶鞘，然后依次为第2叶叶片和第2叶叶鞘以及第3叶叶片和第3叶叶鞘。预测模型的结果表明，全波段作为输入的模型效果比以单一植被指数SIPI 构建的随机森林模型更好，模型准确率达到85.9%。【结论】本研究反映了不同抗感水稻品种受褐飞虱危害后的高光谱变化规律与不同抗感品种和不同部位的差异，并证实了机器学习技术对水稻抗性级别的分类能力。

关键词: 褐飞虱, 水稻抗性, 高光谱, 植被指数, 机器学习

YANG Qixin, LAI Fengxiang, HE Jiachun, WEI Qi, WANG Weixia, WAN Pinjun, FU Qiang. Hyperspectral Properties of Rice Varieties with Varying Resistance Under Brown Planthopper (Nilaparvata lugens) Infestation[J]. Chinese Journal OF Rice Science, 2024, 38(1): 81-90.

杨奇欣, 赖凤香, 何佳春, 魏琪, 王渭霞, 万品俊, 傅强. 不同抗感水稻品种对褐飞虱胁迫的高光谱响应特征[J]. 中国水稻科学, 2024, 38(1): 81-90.

Figures/Tables 8

References 41

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抗性级别 Resistance level	稻苗受害情况 Damage to rice seedlings
1(高抗，HR)	第1叶轻微受害 The first leaf is slightly damaged
3(抗，R)	第1叶明显受害，叶片发黄、叶尖枯死 The first leaf is visibly affected, with yellowing leaf blade and death of the leaf tip
5(中抗，MR)	第1、2叶明显受害，叶片发黄、叶尖枯死 The 1st and 2nd leaves are visibly affected, with yellowing leaf blades and withering leaf tips
7(感，S)	第1、2、3叶明显受害，叶片发黄、叶尖枯死 The 1st, 2nd and 3rd leaves are visibly affected, with yellowing leaf blades and withering leaf tips
9(高感，HS)	稻株整体枯死 The rice plant is withering

抗性级别 Resistance level	稻苗受害情况 Damage to rice seedlings
1(高抗，HR)	第1叶轻微受害 The first leaf is slightly damaged
3(抗，R)	第1叶明显受害，叶片发黄、叶尖枯死 The first leaf is visibly affected, with yellowing leaf blade and death of the leaf tip
5(中抗，MR)	第1、2叶明显受害，叶片发黄、叶尖枯死 The 1st and 2nd leaves are visibly affected, with yellowing leaf blades and withering leaf tips
7(感，S)	第1、2、3叶明显受害，叶片发黄、叶尖枯死 The 1st, 2nd and 3rd leaves are visibly affected, with yellowing leaf blades and withering leaf tips
9(高感，HS)	稻株整体枯死 The rice plant is withering

品种 Rice variety	受害水平Damage rating
品种 Rice variety	1级 Level 1	3级 Level 3	5级 Level 5	7级 Level 7	9级 Level 9
TN1	66	78	66	54	156
Mudgo	96	120	192	6	6
RHT	252	126	42	0	0

品种 Rice variety	受害水平Damage rating
品种 Rice variety	1级 Level 1	3级 Level 3	5级 Level 5	7级 Level 7	9级 Level 9
TN1	66	78	66	54	156
Mudgo	96	120	192	6	6
RHT	252	126	42	0	0

指数名称 Name of the index	计算公式 Calculation formula	TN1	Mudgo	RHT	品种合并 Merge analysis
SIPI	(R₈₀₀−R₄₄₅)/(R₈₀₀+R₆₈₀)	−0.7978	−0.5510	−0.4826	−0.7053
SR_605/760	(R₆₀₅/R₇₆₀)	0.7847	0.5539	0.4829	0.6885
PSND_b	(R₈₀₀−R₆₃₅)/(R₈₀₀+R₆₃₅)	−0.7774	−0.5494	−0.4731	−0.6924
680 nm(最敏感光波) 680 nm(Most sensitive light wave)		0.7265	0.5217	0.4556	0.6456