梭梭和头状沙拐枣形态及生理生化特性对干旱胁迫的响应

doi:10.13866/j.azr.2024.07.09

Abstract

Abstract:

Desertification and drought have emerged as global ecological issues, which pose significant difficulties for plant adaptability and survival. Consequently, it is crucial to investigate the adaptation mechanisms of plants to drought stress to preserve and grow sustainably artificial ecosystems in desert regions. This study examined the physiological, biochemical, and morphological responses of Haloxylon ammodendron and Calligonum caput-medusae in the Taklimakan Desert shelterbelt by employing two treatments: irrigation (20-day irrigation cycle) (CK) and drought (D). The findings demonstrated that under drought stress, the assimilatory branches of both plants were noticeably shorter in terms of morphological traits. The branches of both were also significantly thinner. Regarding physiological reactions, there were no notable distinctions between the two in terms of the photosynthetic gas exchange parameters and the leaf dry mass during drought stress. Additionally, the carboxylation processes, metabolic reaction rates, chlorophyll a, chlorophyll b, total chlorophyll, and photosynthetic enzyme contents of both did not exhibit any appreciable alterations under drought stress. However, both showed substantially reduced Fm and Fo values. The Fv/Fm values of H. ammodendron were noticeably greater, but those of C. caput-medusae did not change much. According to our study, H. ammodendron and C. caput-medusae were able to adapt to drought by reducing the assimilate-branch growth, excitation capacity, and photosynthetic pigment activity, thereby preserving photosynthetic capacity. The photochemical system of C. caput-medusae was less vulnerable to damage due to a stable chlorophyll concentration.

Key words: drought stress, photosynthetic fluorescence characteristics, morphological features, non-isohydric behavior

ZHANG Bin, LI Congjuan, Yi Guangping, LIU Ran. Physiological, biochemical and morphological responses of Haloxylon ammodendron and Calligonum caput-medusae to drought stress[J].Arid Zone Research, 2024, 41(7): 1177-1184.

Figures/Tables 7

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References 45

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物种	干旱处理	土壤含水量（SWC）/%	同化枝直径（LD）/mm	同化枝长度（LL）/cm	同化枝相对含水量（RWC）/%	同化枝干物质量（LDMC）/%
梭梭 H. ammodendron	D	0.04（0.01）^*	0.72（0.03）^*	1.57（0.12）^**	74（6.40）	35（4.00）
梭梭 H. ammodendron	CK	0.71（0.41）	0.81（0.03）	2.84（0.15）	82（1.30）	54（1.00）
头状沙拐枣 C. caput-medusae	D	0.08（0.02）^*	1.01（0.03）^**	5.11（0.48）^**	69（2.00）^*	39（1.60）^*
头状沙拐枣 C. caput-medusae	CK	0.63（0.12）	1.39（0.03）	10.01（0.37）	78（0.60）	32（2.00）

物种	干旱处理	光合能力（Pn_max） /（μmol CO₂·m^-2·s^-1）	初始羧化效率（CE） /（mol·m^-2·s^-1）	CO₂补偿点（CCP） /（μmol·m^-1）	CO₂饱和点（CSP） /（μmol·m^-1）	光呼吸速率（Rp） /（μmol CO₂·m^-2·s^-1）
H. ammodendron	D	14.53（2.85）	0.11（0.05）	59.33（14.79）	566.33（106.67）	4.89（1.39）
H. ammodendron	CK	25.83（7.78）	0.20（0.08）	31.18（23.99）	554.71（113.33）	2.45（1.16）
C. caput-medusae	D	23.05（7.23）	0.45（0.19）	44.43（25.45）	1038.61（435.63）	13.39（9.00）
C. caput-medusae	CK	18.17（4.11）	0.17（0.01）	34.85（8.00）	1236.23（427.50）	4.66（0.77）

物种	干旱处理	光合酶（Rubisco）/（nmol·g^-1·min^-1）	叶绿素a （Chla）/（mg·g^-1）	叶绿素b （Chlb）/（mg·g^-1）	总叶绿素（Chl）/（mg·g^-1）
H. ammodendron	D	5.40（0.86）	0.10（0.03）	0.02（0.00）	0.11（0.03）
H. ammodendron	CK	7.11（0.76）	0.15（0.02）	0.01（0.00）	0.17（0.03）
C. caput-medusae	D	269.00（42.43）	0.24（0.02）	0.05（0.01）	0.29（0.21）
C. caput-medusae	CK	166.28（25.87）	0.26（0.03）	0.06（0.01）	0.32（0.04）

Physiological, biochemical and morphological responses of Haloxylon ammodendron and Calligonum caput-medusae to drought stress

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