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الفصل 36
هرمونات النبات
Plant hormones—or phytohormones—are chemical molecules that modulate one or more physiological processes of a plant. In animals, hormones…
المستقبلات الضوئية واستجابات النبات للضوء
Light plays a significant role in regulating the growth and development of plants. In addition to providing energy for photosynthesis, light provides…
الساعات البيولوجية والاستجابات الموسمية
The circadian—or biological—clock is an intrinsic, timekeeping, molecular mechanism that allows plants to coordinate physiological…
الردود على الجاذبية واللمس
Gravitropism: Plant Responses to Gravity Higher plants sense gravity using statocytes, cells found near the vascular tissue in shoots, and in the…
الاستجابات للجفاف والفيضانات
Water plays a significant role in the life cycle of plants. However, insufficient or excess of water can be detrimental and pose a serious threat to…
الاستجابات للإجهاد الحار والبارد
Every organism has an optimum temperature range within which healthy growth and physiological functioning can occur. At the ends of this range, there…
الردود على الملح الإجهاد
Salt stress—which can be triggered by high salt concentrations in a plant’s environment—can significantly affect plant growth and…
الدفاعات ضد مسببات الأمراض والحيوانات العاشبة
Plants present a rich source of nutrients for many organisms, making it a target for herbivores and infectious agents. Plants, though lacking a…

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